Late Release of Memory after Effective Lifetime vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: from 2.4.17 up to 2.4.63. Users are recommended to upgrade to version 2.4.64, which fixes the issue.

[Web App Scanning] Apache 2.4.x < 2.4.64 Multiple Vulnerabilities

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-6d7a183951 advisory.

    New httpd 2.4.64 release + security fixes

Tenable has extracted the preceding description block directly from the Fedora 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 342f2a0a-5e9b-11f0-8baa-8447094a420f advisory.

    The Apache httpd project reports:
    moderate: Apache HTTP Server: HTTP response splitting (CVE-2024-42516)     low: Apache HTTP Server: SSRF with mod_headers setting Content-Type header (CVE-2024-43204)     moderate: Apache HTTP Server: SSRF on Windows due to UNC paths (CVE-2024-43394)     low: Apache HTTP Server: mod_ssl error log variable escaping (CVE-2024-47252)     moderate: Apache HTTP Server: mod_ssl access control bypass with session resumption (CVE-2025-23048)     low: Apache HTTP Server: mod_proxy_http2 denial of service (CVE-2025-49630)     moderate: Apache HTTP Server: mod_ssl TLS upgrade attack (CVE-2025-49812)     moderate: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)

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 FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 61d74f80-5e9e-11f0-8baa-8447094a420f advisory.

    The mod_http2 project reports:
    a client can increase memory consumption for a HTTP/2 connection                 via repeated request header names,leading to denial of service     certain proxy configurations whith mod_proxy_http2 as the                 backend, an assertion can be triggered by certain requests, leading                 to denial of service

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 httpd installed on the remote host is prior to 2.4.64. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2025-192-02 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 Apache httpd installed on the remote host is prior to 2.4.64. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.64 advisory.

  - In certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26     through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2.
    Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost     set to on. (CVE-2025-49630)

  - HTTP response splitting in the core of Apache HTTP Server allows an attacker who can manipulate the     Content-Type response headers of applications hosted or proxied by the server can split the HTTP response.
    This vulnerability was described as CVE-2023-38709 but the patch included in Apache HTTP Server 2.4.59 did     not address the issue. Users are recommended to upgrade to version 2.4.64, which fixes this issue.
    (CVE-2024-42516)

  - SSRF in Apache HTTP Server with mod_proxy loaded allows an attacker to send outbound proxy requests to a     URL controlled by the attacker. Requires an unlikely configuration where mod_headers is configured to     modify the Content-Type request or response header with a value provided in the HTTP request. Users are     recommended to upgrade to version 2.4.64 which fixes this issue. (CVE-2024-43204)

  - Server-Side Request Forgery (SSRF) in Apache HTTP Server on Windows allows to potentially leak NTLM hashes     to a malicious server via mod_rewrite or apache expressions that pass unvalidated request input. This     issue affects Apache HTTP Server: from 2.4.0 through 2.4.63. Note: The Apache HTTP Server Project will be     setting a higher bar for accepting vulnerability reports regarding SSRF via UNC paths. The server offers     limited protection against administrators directing the server to open UNC paths. Windows servers should     limit the hosts they will connect over via SMB based on the nature of NTLM authentication.
    (CVE-2024-43394)

  - Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an     untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging     configuration where CustomLog is used with %{varname}x or %{varname}c to log variables provided by     mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized     data provided by the client may appear in log files. (CVE-2024-47252)

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
242040	Fedora 42 : httpd (2025-6d7a183951)	Nessus	Fedora Local Security Checks	high
242028	FreeBSD : Apache httpd -- Multiple vulnerabilities (342f2a0a-5e9b-11f0-8baa-8447094a420f)	Nessus	FreeBSD Local Security Checks	high
242027	FreeBSD : mod_http2 -- Multiple vulnerabilities (61d74f80-5e9e-11f0-8baa-8447094a420f)	Nessus	FreeBSD Local Security Checks	high
242008	Slackware Linux 15.0 / current httpd Multiple Vulnerabilities (SSA:2025-192-02)	Nessus	Slackware Local Security Checks	high
241984	Apache 2.4.x < 2.4.64 Multiple Vulnerabilities	Nessus	Web Servers	high

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