A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability. This affects Undertow 2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be     triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of     service. The highest threat from this vulnerability is to system availability. This affects Undertow     2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1. (CVE-2020-27782)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2025:9582 advisory.

    Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly     application runtime. This release of Red Hat JBoss Enterprise Application Platform 7.1.11 serves as a     replacement for Red Hat JBoss Enterprise Application Platform 7.1.10, and includes bug fixes and     enhancements. See the Red Hat JBoss Enterprise Application Platform 7.1.11 Release Notes for information     about the most significant bug fixes and enhancements included in this release.

    Security Fix(es):

    * undertow: special character in query results in server errors [eap-7.1.z] (CVE-2020-27782)

    * wildfly: unsafe deserialization in Wildfly Enterprise Java Beans [eap-7.1.z] (CVE-2020-10740)

    * libthrift: potential DoS when processing untrusted payloads [eap-7.1.z] (CVE-2020-13949)

    * netty-all: netty-codec: SnappyFrameDecoder doesn't restrict chunk length and may buffer skippable chunks     in an unnecessary way [eap-7.1.z] (CVE-2021-37137)

    * hibernate-core: SQL injection vulnerability when both hibernate.use_sql_comments and JPQL String     literals are used [eap-7.1.z] (CVE-2020-25638)

    * wildfly-openssl: memory leak per HTTP session creation in WildFly OpenSSL - WFSSL-51 - Memory leak with     mutual authentication and OpenSSL (CVE-2020-25644)

    * netty-all: netty-codec: Bzip2Decoder doesn't allow setting size restrictions for decompressed data     [eap-7.1.z] (CVE-2021-37136)

    * jackson-databind: denial of service via a large depth of nested objects [eap-7.1.z] (CVE-2020-36518)

    * eap: JBoss EAP: wildfly-elytron has a SSRF security issue [eap-7.1.z] (CVE-2024-1233)

    * keycloak: org.keycloak.protocol.oidc: unvalidated cross-origin messages in checkLoginIframe leads to     DDoS [eap-7.1.z] (CVE-2024-1249)

    * undertow: Server identity in https connection is not checked by the undertow client [eap-7.1.z]     (CVE-2022-4492)

    * undertow: AJP Request closes connection exceeding maxRequestSize [eap-7.1.z] (CVE-2023-5379)

    * undertow: potential security issue in flow control over HTTP/2 may lead to DOS(incomplete fix for     CVE-2021-3629) [eap-7.1.z] (CVE-2022-1259)

    * wildfly-elytron: possible timing attacks via use of unsafe comparator [eap-7.1.z] (CVE-2022-3143)

    * jakarta-el: ELParserTokenManager enables invalid EL expressions to be evaluate [eap-7.1.z]     (CVE-2021-28170)

    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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be
    triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of
    service. The highest threat from this vulnerability is to system availability. This affects Undertow
    2.1.5.SP1, 2.0.33.SP2, and 2.2.3.SP1. (CVE-2020-27782)

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0246 advisory.

    Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly     application runtime.

    This release of Red Hat JBoss Enterprise Application Platform 7.3.5 serves as a replacement for Red Hat     JBoss Enterprise Application Platform 7.3.4, and includes bug fixes and enhancements. See the Red Hat     JBoss Enterprise Application Platform 7.3.5 Release Notes for information about the most significant bug     fixes and enhancements included in this release.

    Security Fix(es):

    * wildfly: Potential Memory leak in Wildfly when using OpenTracing (CVE-2020-27822)

    * undertow: special character in query results in server errors (CVE-2020-27782)

    * wildfly-core: memory leak in WildFly host-controller in domain mode while not able to reconnect to     domain-controller (CVE-2020-25689)

    * httpclient: apache-httpclient: incorrect handling of malformed authority component in request URIs     (CVE-2020-13956)

    * wildfly: resource adapter logs plaintext JMS password at warning level on connection error     (CVE-2020-25640)

    * resteasy-client: potential sensitive information leakage in JAX-RS RESTEasy Client's     WebApplicationException handling (CVE-2020-25633)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, see 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 remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0248 advisory.

    Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly     application runtime.

    This release of Red Hat JBoss Enterprise Application Platform 7.3.5 serves as a replacement for Red Hat     JBoss Enterprise Application Platform 7.3.4, and includes bug fixes and enhancements. See the Red Hat     JBoss Enterprise     Application Platform 7.3.5 Release Notes for information about the most significant bug fixes and     enhancements included in this release.

    Security Fix(es):

    * wildfly: Potential Memory leak in Wildfly when using OpenTracing (CVE-2020-27822)

    * undertow: special character in query results in server errors (CVE-2020-27782)

    * wildfly-core: memory leak in WildFly host-controller in domain mode while not able to reconnect to     domain-controller (CVE-2020-25689)

    * httpclient: apache-httpclient: incorrect handling of malformed authority component in request URIs     (CVE-2020-13956)

    * wildfly: resource adapter logs plaintext JMS password at warning level on connection error     (CVE-2020-25640)

    * resteasy-client: potential sensitive information leakage in JAX-RS RESTEasy Client's     WebApplicationException handling (CVE-2020-25633)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, see 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 remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0247 advisory.

    Red Hat JBoss Enterprise Application Platform 7 is a platform for Java applications based on the WildFly     application runtime.

    This release of Red Hat JBoss Enterprise Application Platform 7.3.5 serves as a replacement for Red Hat     JBoss Enterprise Application Platform 7.3.4, and includes bug fixes and enhancements. See the Red Hat     JBoss Enterprise Application Platform 7.3.5 Release Notes for information about the most significant bug     fixes and enhancements included in this release.

    Security Fix(es):

    * wildfly: Potential Memory leak in Wildfly when using OpenTracing (CVE-2020-27822)

    * undertow: special character in query results in server errors (CVE-2020-27782)

    * wildfly-core: memory leak in WildFly host-controller in domain mode while not able to reconnect to     domain-controller (CVE-2020-25689)

    * httpclient: apache-httpclient: incorrect handling of malformed authority component in request URIs     (CVE-2020-13956)

    * wildfly: resource adapter logs plaintext JMS password at warning level on connection error     (CVE-2020-25640)

    * resteasy-client: potential sensitive information leakage in JAX-RS RESTEasy Client's     WebApplicationException handling (CVE-2020-25633)

    For more details about the security issue(s), including the impact, a CVSS score, and other related     information, see 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.

ID	Name	Product	Family	Type	Severity
251674	Linux Distros Unpatched Vulnerability : CVE-2020-27782	Nessus	Misc.	Local	high
240506	RHEL 7 : Red Hat JBoss Enterprise Application Platform 7.1.11 on RHEL 7 (RHSA-2025:9582)	Nessus	Red Hat Local Security Checks	Local	high
418749	SCA: security update for io.undertow:undertow-core (GHSA-rhcw-wjcm-9h6g)	Tenable Cloud Security	SCA Checks	Local	high
418749	SCA: security update for io.undertow:undertow-core (GHSA-rhcw-wjcm-9h6g)	Tenable Self-Hosted Container Security	SCA Checks	Local	high
145408	RHEL 6 : Red Hat JBoss Enterprise Application Platform 7.3.5 (RHSA-2021:0246)	Nessus	Red Hat Local Security Checks	Local	medium
145407	RHEL 8 : Red Hat JBoss Enterprise Application Platform 7.3.5 (RHSA-2021:0248)	Nessus	Red Hat Local Security Checks	Local	medium
145405	RHEL 7 : Red Hat JBoss Enterprise Application Platform 7.3.5 (RHSA-2021:0247)	Nessus	Red Hat Local Security Checks	Local	medium

Detections

Analytics

CVE-2020-27782

high

Tenable Plugins

high

high

high

high

medium

medium

medium