Detections
Analytics

Linux Distros Unpatched Vulnerability : CVE-2026-34477

medium Nessus Plugin ID 306170

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

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

 - The fix for CVE-2025-68161 https://logging.apache.org/security.html#CVE-2025-68161 was incomplete: it addressed hostname verification only when enabled via the log4j2.sslVerifyHostName https://logging.apache.org/log4j/2.x/manual/systemproperties.html#log4j2.sslVerifyHostName system property, but not when configured through the verifyHostName https://logging.apache.org/log4j/2.x/manual/appenders/network.html#SslConfiguration-attr-verifyHostName attribute of the <Ssl> element. Although the verifyHostName configuration attribute was introduced in Log4j Core 2.12.0, it was silently ignored in all versions through 2.25.3, leaving TLS connections vulnerable to interception regardless of the configured value. A network-based attacker may be able to perform a man-in-the-middle attack when all of the following conditions are met: * An SMTP, Socket, or Syslog appender is in use. * TLS is configured via a nested <Ssl> element. * The attacker can present a certificate issued by a CA trusted by the appender's configured trust store, or by the default Java trust store if none is configured. This issue does not affect users of the HTTP appender, which uses a separate verifyHostname https://logging.apache.org/log4j/2.x/manual/appenders/network.html#HttpAppender-attr- verifyHostName attribute that was not subject to this bug and verifies host names by default. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue. (CVE-2026-34477)

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

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-34477

Plugin Details

Severity: Medium

ID: 306170

File Name: unpatched_CVE_2026_34477.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 4/13/2026

Updated: 4/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.9

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.9

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-34477

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.8

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:resteasy-javadoc, p-cpe:/a:redhat:enterprise_linux:pki-resteasy, p-cpe:/a:redhat:enterprise_linux:pki-resteasy-core, p-cpe:/a:redhat:enterprise_linux:pki-resteasy-servlet-initializer, p-cpe:/a:centos:centos:pki-resteasy, p-cpe:/a:centos:centos:pki-resteasy-core, p-cpe:/a:centos:centos:pki-resteasy-servlet-initializer, p-cpe:/a:centos:centos:log4j-slf4j, p-cpe:/a:redhat:enterprise_linux:log4j-slf4j, p-cpe:/a:centos:centos:resteasy-javadoc, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:redhat:enterprise_linux:log4j, p-cpe:/a:centos:centos:log4j, p-cpe:/a:redhat:enterprise_linux:resteasy, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:resteasy, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:pki-resteasy-client, p-cpe:/a:redhat:enterprise_linux:pki-resteasy-jackson2-provider, p-cpe:/a:centos:centos:pki-resteasy-client, p-cpe:/a:centos:centos:pki-resteasy-jackson2-provider, p-cpe:/a:centos:centos:log4j-jcl, p-cpe:/a:redhat:enterprise_linux:log4j-jcl, p-cpe:/a:centos:centos:log4j-web, p-cpe:/a:redhat:enterprise_linux:log4j-web

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 4/10/2026

Reference Information

CVE: CVE-2026-34477