Is CVE-2023-0494 in the CISA KEV catalog?

No. CVE-2023-0494 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-0494?

CVE-2023-0494 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2023-0494?

CVE-2023-0494 has an EPSS score of 0.90% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-0494?

Upgrade xorg-server on debian 11 to 2:1.20.11-1+deb11u5 or later. Fixes are available for 58 affected products.

CVE & CISA-KEV Catalog

CVE-2023-0494

HIGH

7.8

CVSS v3

NVD

Description

A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in DeepCopyPointerClasses that can be exploited by ProcXkbSetDeviceInfo() and ProcXkbGetDeviceInfo() to read and write into freed memory. This can lead to local privilege elevation on systems where the X server runs privileged and remote code execution for ssh X forwarding sessions.

CWE-416Use After Free

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:1.20.11-1+deb11u5CVE-2023-0494

Fixed in:2:21.1.7-1CVE-2023-0494

tigervncRocky

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervncRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-debuginfoRocky

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-debuginfoRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-serverRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-serverRocky

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-server-appletRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-server-appletRocky

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-server-moduleRocky

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

tigervnc-server-moduleRed Hat / RHEL

Fixed in:0:1.1.0-25.el6_10.13RHSA-2025:12751

xorg-x11-serverRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-serverRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XdmxRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XdmxRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xdmx-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xdmx-debuginfoRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XephyrRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XephyrRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xephyr-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xephyr-debuginfoRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XnestRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XnestRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xnest-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xnest-debuginfoRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XorgRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XorgRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xorg-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xorg-debuginfoRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XvfbRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XvfbRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xvfb-debuginfoRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-Xvfb-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-XwaylandRed Hat / RHEL

Fixed in:0:21.1.3-10.el8RHSA-2023:2805

Fixed in:0:21.1.3-7.el9RHSA-2023:2249

xorg-x11-server-XwaylandRocky

Fixed in:0:21.1.3-10.el8RHSA-2023:2805

Fixed in:0:21.1.3-7.el9RHSA-2023:2249

xorg-x11-server-Xwayland-debuginfoRed Hat / RHEL

Fixed in:0:21.1.3-10.el8RHSA-2023:2805

Fixed in:0:21.1.3-7.el9RHSA-2023:2249

xorg-x11-server-Xwayland-debuginfoRocky

Fixed in:0:21.1.3-10.el8RHSA-2023:2805

Fixed in:0:21.1.3-7.el9RHSA-2023:2249

xorg-x11-server-Xwayland-debugsourceRocky

Fixed in:0:21.1.3-10.el8RHSA-2023:2805

Fixed in:0:21.1.3-7.el9RHSA-2023:2249

xorg-x11-server-Xwayland-debugsourceRed Hat / RHEL

Fixed in:0:21.1.3-10.el8RHSA-2023:2805

Fixed in:0:21.1.3-7.el9RHSA-2023:2249

xorg-x11-server-commonRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-commonRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-debuginfoRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-debugsourceRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-debugsourceRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-develRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-develRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-sourceRocky

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-x11-server-sourceRed Hat / RHEL

Fixed in:0:1.20.11-15.el8RHSA-2023:2806

Fixed in:0:1.20.11-17.el9RHSA-2023:2248

xorg-serverUbuntu

Fixed in:2:1.15.1-0ubuntu2.11+esm7USN-5778-2

Fixed in:2:1.18.4-0ubuntu0.12+esm5USN-5778-2

Fixed in:2:1.19.6-1ubuntu4.14USN-5846-1

Fixed in:2:1.20.13-1ubuntu1~20.04.6USN-5846-1

Fixed in:2:21.1.3-2ubuntu2.7USN-5846-1

Fixed in:2:21.1.4-2ubuntu1.5USN-5846-1

xorg-server-hwe-16.04Ubuntu

Fixed in:2:1.19.6-1ubuntu4.1~16.04.6+esm4USN-5778-2

xorg-server-hwe-18.04Ubuntu

Fixed in:2:1.20.8-2ubuntu2.2~18.04.10USN-5846-1

xserver-xorg-coreUbuntu

Fixed in:2:1.15.1-0ubuntu2.11+esm7USN-5778-2

Fixed in:2:1.18.4-0ubuntu0.12+esm5USN-5778-2

Fixed in:2:1.19.6-1ubuntu4.14USN-5846-1

Fixed in:2:1.20.13-1ubuntu1~20.04.6USN-5846-1

Fixed in:2:21.1.3-2ubuntu2.7USN-5846-1

Fixed in:2:21.1.4-2ubuntu1.5USN-5846-1

xserver-xorg-core-hwe-16.04Ubuntu

Fixed in:2:1.19.6-1ubuntu4.1~16.04.6+esm4USN-5778-2

xserver-xorg-core-hwe-18.04Ubuntu

Fixed in:2:1.20.8-2ubuntu2.2~18.04.10USN-5846-1

xwaylandUbuntu

Fixed in:2:1.18.4-0ubuntu0.12+esm5USN-5778-2

Fixed in:2:1.19.6-1ubuntu4.14USN-5846-1

Fixed in:2:1.20.13-1ubuntu1~20.04.6USN-5846-1

Fixed in:2:22.1.1-1ubuntu0.5USN-5846-1

Fixed in:2:22.1.3-2ubuntu0.3USN-5846-1

xwayland-hwe-16.04Ubuntu

Fixed in:2:1.19.6-1ubuntu4.1~16.04.6+esm4USN-5778-2

xwayland-hwe-18.04Ubuntu

Fixed in:2:1.20.8-2ubuntu2.2~18.04.10USN-5846-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.90%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Patch1

gitlab.freedesktop.org

Vendor Advisory1

lists.x.org

Third-Party Advisory1

bugzilla.redhat.com

Other references1

security.gentoo.org

Related Vulnerabilities

Other CWE-416 (Use After Free) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0708	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-31166	Critical	9.8	100%	KEV	Fix
CVE-2015-5119	Critical	9.8	99%	KEV	-
CVE-2010-3962	High	8.1	97%	KEV	-
CVE-2015-0313	Critical	9.8	96%	KEV	Fix
CVE-2017-9798	High	7.5	95%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-02-24.