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CVE-2023-3138

7.5 · HIGH

A vulnerability was found in libX11.

Published Jun 28, 2023CWE-119EPSS 1.66%

Overview

CVE-2023-3138 is a high-severity vulnerability. It was published on June 28, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/security/cve/CVE-2023-3138Refgitlab.freedesktop.org/xorg/lib/libx11/-/commit/304a654a0d57bf0f00d8998185f0360332cfa36cReflists.x.org/archives/xorg-announce/2023-June/003406.htmlReflists.x.org/archives/xorg-announce/2023-June/003407.htmlRefsecurity.netapp.com/advisory/ntap-20231208-0008/Refaccess.redhat.com/security/cve/CVE-2023-3138Refgitlab.freedesktop.org/xorg/lib/libx11/-/commit/304a654a0d57bf0f00d8998185f0360332cfa36cReflists.x.org/archives/xorg-announce/2023-June/003406.htmlReflists.x.org/archives/xorg-announce/2023-June/003407.htmlRefsecurity.netapp.com/advisory/ntap-20231208-0008/

How CyberStrike helps

Frequently asked questions

What is CVE-2023-3138?

CVE-2023-3138 is a high-severity vulnerability. It was published on June 28, 2023 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2023-3138?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-3138?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-3138?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-3138 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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