Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance.

The remote NewStart CGSL host, running version MAIN 7.02, has httpd packages installed that are affected by multiple vulnerabilities:

  - Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclosure,     SSRF or local script execution via backend applications whose response headers are malicious or     exploitable. Users are recommended to upgrade to version 2.4.60, which fixes this issue. (CVE-2024-38476)

  - Out-of-bounds Read vulnerability in mod_macro of Apache HTTP Server.This issue affects Apache HTTP Server:
    through 2.4.57. (CVE-2023-31122)

  - An attacker, opening a HTTP/2 connection with an initial window size of 0, was able to block handling of     that connection indefinitely in Apache HTTP Server. This could be used to exhaust worker resources in the     server, similar to the well known slow loris attack pattern. This has been fixed in version 2.4.58, so     that such connection are terminated properly after the configured connection timeout. This issue affects     Apache HTTP Server: from 2.4.55 through 2.4.57. Users are recommended to upgrade to version 2.4.58, which     fixes the issue. (CVE-2023-43622)

  - When a HTTP/2 stream was reset (RST frame) by a client, there was a time window were the request's memory     resources were not reclaimed immediately. Instead, de-allocation was deferred to connection close. A     client could send new requests and resets, keeping the connection busy and open and causing the memory     footprint to keep on growing. On connection close, all resources were reclaimed, but the process might run     out of memory before that. This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid     Reset Exploit) with their own test client. During normal HTTP/2 use, the probability to hit this bug is     very low. The kept memory would not become noticeable before the connection closes or times out. Users are     recommended to upgrade to version 2.4.58, which fixes the issue. (CVE-2023-45802)

  - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance. (CVE-2024-36387)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2024:0499 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2024-36387:
    Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance.

    CVE-2024-38472:
    SSRF in Apache HTTP Server on Windows allows to potentially leak NTML hashes to a malicious server via     SSRF andmalicious requests or content     Users are recommended to upgrade to version 2.4.60 which fixes this issue. Note: Existing configurations     that access UNC paths will have to configure new directive UNCList to allow access during request     processing.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:3452 advisory.

    Red Hat JBoss Core Services is a set of supplementary software for Red Hat JBoss middleware products. This     software, such as Apache HTTP Server, is common to multiple JBoss middleware products and packaged under     Red Hat JBoss Core Services, to allow for faster distribution of updates and for a more consistent update     experience.

    This release of Red Hat JBoss Core Services Apache HTTP Server 2.4.62 serves as a replacement for Red Hat     JBoss Core Services Apache HTTP Server 2.4.57 Service Pack 6, and includes bug fixes and enhancements,     which are documented in the Release Notes linked to in the References section.

    Security Fix(es):

    * openssl: SSL_select_next_proto buffer overread (CVE-2024-5535)
    * mod_http2: DoS by null pointer in websocket over HTTP/2 (CVE-2024-36387)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of httpd installed on the remote Azure Linux 3.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2024-36387 advisory.

  - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance. (CVE-2024-36387)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote RockyLinux 9 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2024:8680 advisory.

    * mod_http2: DoS by null pointer in websocket over HTTP/2 (CVE-2024-36387)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 9 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2024:8680 advisory.

    * mod_http2: DoS by null pointer in websocket over HTTP/2 (CVE-2024-36387)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has a package installed that is affected by a vulnerability as referenced in the ELSA-2024-8680 advisory.

    [2.0.26-2.1]
    - Resolves: RHEL-45803 - mod_http2: DoS by null pointer in websocket       over HTTP/2 (CVE-2024-36387)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by a vulnerability as referenced in the RHSA-2024:8680 advisory.

    The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4     servers.

    Security Fix(es):

    * mod_http2: DoS by null pointer in websocket over HTTP/2 (CVE-2024-36387)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote host is affected by the vulnerability described in GLSA-202409-31 (Apache HTTPD: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Apache HTTPD. Please review the CVE identifiers     referenced below for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its self-reported version, the Tenable Security Center running on the remote host is 6.2.1, 6.3.0 or 6.4.0.
It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2024-13 advisory.

  - Security Center leverages third-party software to help provide underlying functionality. Several of the     third-party components (Apache, libcurl) were found to contain vulnerabilities, and updated versions have     been made available by the providers.Out of caution and in line with best practice, Tenable has opted to     upgrade these components to address the potential impact of the issues. Security Center Patch SC-202408.1     updates Apache to version 2.4.62 and libcurl to version 8.8.0 to address the identified vulnerabilities.
    Tenable has released Security Center Patch SC-202408.1 to address these issues. The installation files can     be obtained from the Tenable Downloads Portal: https://www.tenable.com/downloads/security-center     (CVE-2024-2004, CVE-2024-2379, CVE-2024-2398, CVE-2024-2466, CVE-2024-36387, CVE-2024-38472,     CVE-2024-38473, CVE-2024-38474, CVE-2024-38475, CVE-2024-38476, CVE-2024-38477, CVE-2024-39573,     CVE-2024-39884, CVE-2024-40725, CVE-2024-40898, CVE-2024-6197, CVE-2024-6874)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2024-689 advisory.

    Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance. (CVE-2024-36387)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 39 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2024-661bb6322d advisory.

    - version update to 2.0.29
    - security update

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 40 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2024-cb8acbf644 advisory.

    - version update to 2.0.29
    - security update

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:2597-1 advisory.

    - CVE-2024-36387: Fixed DoS by null pointer in websocket over HTTP/2 (bsc#1227272)
    - CVE-2024-38475: Fixed improper escaping of output in mod_rewrite (bsc#1227268)
    - CVE-2024-38476: Fixed server may use exploitable/malicious backend application output to run local     handlers via internal redirect (bsc#1227269)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of httpd installed on the remote CBL Mariner 2.0 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the CVE-2024-36387 advisory.

  - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance. (CVE-2024-36387)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 20.04 LTS / 22.04 LTS / 23.10 / 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6885-1 advisory.

    Marc Stern discovered that the Apache HTTP Server incorrectly handled serving WebSocket protocol upgrades     over HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to crash,     resulting in a denial of service. (CVE-2024-36387)

    Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly sent certain request URLs     with incorrect encodings to backends. A remote attacker could possibly use this issue to bypass     authentication. (CVE-2024-38473)

    Orange Tsai discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain     substitutions. A remote attacker could possibly use this issue to execute scripts in directories not     directly reachable by any URL, or cause a denial of service. Some environments may require using the new     UnsafeAllow3F flag to handle unsafe substitutions. (CVE-2024-38474, CVE-2024-38475, CVE-2024-39573)

    Orange Tsai discovered that the Apache HTTP Server incorrectly handled certain response headers. A remote     attacker could possibly use this issue to obtain sensitive information, execute local scripts, or perform     SSRF attacks. (CVE-2024-38476)

    Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests.
    A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of     service. (CVE-2024-38477)

    It was discovered that the Apache HTTP Server incorrectly handled certain handlers configured via AddType.
    A remote attacker could possibly use this issue to obtain source code. (CVE-2024-39884)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.60. It is, therefore, affected by multiple vulnerabilities:

 - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance. (CVE-2024-36387)

 - SSRF in Apache HTTP Server on Windows allows to potentially leak NTML hashes to a malicious server via SSRF and malicious requests or content. (CVE-2024-38472)

 - Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. (CVE-2024-38473)

 - Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute scripts in directories permitted by the configuration but not directly reachable by any URL or source disclosure of scripts meant to only to be executed as CGI. (CVE-2024-38474)

 - Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. (CVE-2024-38475)

 - Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclosure, SSRF or local script execution via backend applications whose response headers are malicious or exploitable. (CVE-2024-38476)

 - Null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash the server via a malicious request. (CVE-2024-38477)

 - Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause unsafe RewriteRules to unexpectedly setup URL's to be handled by mod_proxy. (CVE-2024-39573)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of httpd installed on the remote host is prior to 2.4.60. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2024-184-01 advisory.

    New httpd packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the httpd security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the d7efc2ad-37af-11ef-b611-84a93843eb75 advisory.

    The Apache httpd project reports:
    DoS by Null pointer in websocket over HTTP/2 (CVE-2024-36387) (Low).
                Serving WebSocket protocol upgrades over a HTTP/2 connection could                 result in a Null Pointer dereference, leading to a crash of the server                 process, degrading performance.
    Proxy encoding problem (CVE-2024-38473) (Moderate).
                Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier                 allows request URLs with incorrect encoding to be sent to backend                 services, potentially bypassing authentication via crafted requests.
    Weakness with encoded question marks in backreferences                 (CVE-2024-38474) (Important). Substitution encoding issue in                 mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker                 to execute scripts in directories permitted by the configuration but                 not directly reachable by any URL or source disclosure of scripts                 meant to only to be executed as CGI.
    Weakness in mod_rewrite when first segment of substitution matches                 filesystem path (CVE-2024-38475) (Important). Improper escaping of                 output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows                 an attacker to map URLs to filesystem locations that are permitted to                 be served by the server but are not intentionally/directly reachable                 by any URL, resulting in code execution or source code disclosure.
                Substitutions in server context that use a backreferences or variables                 as the first segment of the substitution are affected. Some unsafe                 RewiteRules will be broken by this change and the rewrite flag                 UnsafePrefixStat can be used to opt back in once ensuring the                 substitution is appropriately constrained.
    may use exploitable/malicious backend application output to run local                 handlers via internal redirect (CVE-2024-38476) (Important).
                Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are                 vulnerable to information disclosure, SSRF or local script execution                 via backend applications whose response headers are malicious or                 exploitable.
    Crash resulting in Denial of Service in mod_proxy via a malicious                 request (CVE-2024-38477) (Important). Null pointer dereference in                 mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker                 to crash the server via a malicious request.
    mod_rewrite proxy handler substitution (CVE-2024-39573) (Moderate).
                Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier                 allows an attacker to cause unsafe RewriteRules to unexpectedly setup                 URL's to be handled by mod_proxy.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Apache httpd installed on the remote host is prior to 2.4.60. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.60 advisory.

  - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance. (CVE-2024-36387)

  - SSRF in Apache HTTP Server on Windows allows to potentially leak NTML hashes to a malicious server via     SSRF and malicious requests or content Users are recommended to upgrade to version 2.4.60 which fixes this     issue. Note: Existing configurations that access UNC paths will have to configure new directive UNCList     to allow access during request processing. (CVE-2024-38472)

  - Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect     encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users     are recommended to upgrade to version 2.4.60, which fixes this issue. (CVE-2024-38473)

  - Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to     execute scripts in directories permitted by the configuration but not directly reachable by any URL or     source disclosure of scripts meant to only to be executed as CGI. Users are recommended to upgrade to     version 2.4.60, which fixes this issue. Some RewriteRules that capture and substitute unsafely will now     fail unless rewrite flag UnsafeAllow3F is specified. (CVE-2024-38474)

  - Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to     map URLs to filesystem locations that are permitted to be served by the server but are not     intentionally/directly reachable by any URL, resulting in code execution or source code disclosure.
    Substitutions in server context that use a backreferences or variables as the first segment of the     substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag     UnsafePrefixStat can be used to opt back in once ensuring the substitution is appropriately constrained.
    (CVE-2024-38475)

  - Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclosure,     SSRF or local script execution via backend applications whose response headers are malicious or     exploitable. Users are recommended to upgrade to version 2.4.60, which fixes this issue. (CVE-2024-38476)

  - null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash     the server via a malicious request. Users are recommended to upgrade to version 2.4.60, which fixes this     issue. (CVE-2024-38477)

  - Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause unsafe     RewriteRules to unexpectedly setup URL's to be handled by mod_proxy. Users are recommended to upgrade to     version 2.4.60, which fixes this issue. (CVE-2024-39573)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
242800	NewStart CGSL MAIN 7.02 : httpd Multiple Vulnerabilities (NS-SA-2025-0132)	Nessus	NewStart CGSL Local Security Checks	critical
240014	TencentOS Server 4: httpd (TSSA-2024:0499)	Nessus	Tencent Local Security Checks	high
233925	RHEL 7 / 8 : Red Hat JBoss Core Services Apache HTTP Server 2.4.62 (RHSA-2025:3452)	Nessus	Red Hat Local Security Checks	critical
215251	Azure Linux 3.0 Security Update: httpd (CVE-2024-36387)	Nessus	Azure Linux Local Security Checks	medium
210612	RockyLinux 9 : mod_http2 (RLSA-2024:8680)	Nessus	Rocky Linux Local Security Checks	medium
210139	AlmaLinux 9 : mod_http2 (ALSA-2024:8680)	Nessus	Alma Linux Local Security Checks	medium
210014	Oracle Linux 9 : mod_http2 (ELSA-2024-8680)	Nessus	Oracle Linux Local Security Checks	medium
209927	RHEL 9 : mod_http2 (RHSA-2024:8680)	Nessus	Red Hat Local Security Checks	medium
207890	GLSA-202409-31 : Apache HTTPD: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
205527	Tenable Security Center Multiple Vulnerabilities (TNS-2024-13)	Nessus	Misc.	critical
205096	Amazon Linux 2023 : mod_http2 (ALAS2023-2024-689)	Nessus	Amazon Linux Local Security Checks	medium
204819	Fedora 39 : mod_http2 (2024-661bb6322d)	Nessus	Fedora Local Security Checks	medium
204812	Fedora 40 : mod_http2 (2024-cb8acbf644)	Nessus	Fedora Local Security Checks	medium
204739	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : apache2 (SUSE-SU-2024:2597-1)	Nessus	SuSE Local Security Checks	critical
202738	CBL Mariner 2.0 Security Update: httpd (CVE-2024-36387)	Nessus	MarinerOS Local Security Checks	medium
201972	Ubuntu 20.04 LTS / 22.04 LTS / 23.10 / 24.04 LTS : Apache HTTP Server vulnerabilities (USN-6885-1)	Nessus	Ubuntu Local Security Checks	critical
114360	Apache 2.4.x < 2.4.60 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
201303	Slackware Linux 15.0 / current httpd Multiple Vulnerabilities (SSA:2024-184-01)	Nessus	Slackware Local Security Checks	critical
201253	FreeBSD : Apache httpd -- Multiple vulnerabilities (d7efc2ad-37af-11ef-b611-84a93843eb75)	Nessus	FreeBSD Local Security Checks	critical
201198	Apache 2.4.x < 2.4.60 Multiple Vulnerabilities	Nessus	Web Servers	critical

Detections

Analytics

CVE-2024-36387

medium

Tenable Plugins

critical

high

critical

medium

medium

medium

medium

medium

critical

critical

medium

medium

medium

critical

medium

critical

critical

critical

critical

critical