Is CVE-2023-1393 in the CISA KEV catalog?

No. CVE-2023-1393 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-1393?

CVE-2023-1393 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2023-1393?

CVE-2023-1393 has an EPSS score of 0.44% (35th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-1393?

Upgrade xorg-server on debian 11 to 2:1.20.11-1+deb11u6 or later. Fixes are available for 55 affected products.

CVE & CISA-KEV Catalog

CVE-2023-1393

HIGH

7.8

CVSS v3

NVD

Description

A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation. If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.

CWE-416Use After Free

How to fix

Remediation Available

xorg-serverDebian

Fixed in:2:1.20.11-1+deb11u6CVE-2023-1393

Fixed in:2:21.1.7-2CVE-2023-1393

tigervncRed Hat / RHEL

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

tigervncRocky

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-debuginfoRocky

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:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-serverRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XdmxRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XdmxRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-Xdmx-debuginfoRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

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

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XephyrRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XephyrRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

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

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-Xephyr-debuginfoRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XnestRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XnestRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-Xnest-debuginfoRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

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

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XorgRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XorgRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

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

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-Xorg-debuginfoRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XvfbRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XvfbRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-Xvfb-debuginfoRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

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

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-XwaylandRed Hat / RHEL

Fixed in:0:21.1.3-12.el8RHSA-2023:6917

Fixed in:0:22.1.9-2.el9RHSA-2023:6341

xorg-x11-server-XwaylandRocky

Fixed in:0:21.1.3-12.el8RHSA-2023:6917

Fixed in:0:22.1.9-2.el9RHSA-2023:6341

xorg-x11-server-Xwayland-debuginfoRocky

Fixed in:0:21.1.3-12.el8RHSA-2023:6917

Fixed in:0:22.1.9-2.el9RHSA-2023:6341

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

Fixed in:0:21.1.3-12.el8RHSA-2023:6917

Fixed in:0:22.1.9-2.el9RHSA-2023:6341

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

Fixed in:0:21.1.3-12.el8RHSA-2023:6917

Fixed in:0:22.1.9-2.el9RHSA-2023:6341

xorg-x11-server-Xwayland-debugsourceRocky

Fixed in:0:21.1.3-12.el8RHSA-2023:6917

Fixed in:0:22.1.9-2.el9RHSA-2023:6341

xorg-x11-server-commonRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-commonRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-debuginfoRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-debuginfoRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-debugsourceRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-debugsourceRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-develRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-develRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-sourceRocky

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-x11-server-sourceRed Hat / RHEL

Fixed in:0:1.20.11-17.el8RHSA-2023:6916

Fixed in:0:1.20.11-19.el9RHSA-2023:6340

xorg-serverUbuntu

Fixed in:2:1.19.6-1ubuntu4.15USN-5986-1

Fixed in:2:1.20.13-1ubuntu1~20.04.8USN-5986-1

Fixed in:2:21.1.3-2ubuntu2.9USN-5986-1

Fixed in:2:21.1.4-2ubuntu1.7USN-5986-1

xorg-server-hwe-18.04Ubuntu

Fixed in:2:1.20.8-2ubuntu2.2~18.04.11USN-5986-1

xserver-xorg-coreUbuntu

Fixed in:2:1.19.6-1ubuntu4.15USN-5986-1

Fixed in:2:1.20.13-1ubuntu1~20.04.8USN-5986-1

Fixed in:2:21.1.3-2ubuntu2.9USN-5986-1

Fixed in:2:21.1.4-2ubuntu1.7USN-5986-1

xserver-xorg-core-hwe-18.04Ubuntu

Fixed in:2:1.20.8-2ubuntu2.2~18.04.11USN-5986-1

xwaylandUbuntu

Fixed in:2:1.19.6-1ubuntu4.15USN-5986-1

Fixed in:2:1.20.13-1ubuntu1~20.04.8USN-5986-1

Fixed in:2:22.1.1-1ubuntu0.6USN-5986-1

Fixed in:2:22.1.3-2ubuntu0.4USN-5986-1

xwayland-hwe-18.04Ubuntu

Fixed in:2:1.20.8-2ubuntu2.2~18.04.11USN-5986-1

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

0.44%probability of exploitation in 30 days

35thpercentile

Low risk: more likely to be exploited than 35% of all known CVEs.

References

Patch1

gitlab.freedesktop.org

Third-Party Advisory2

Other references8

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 2025-08-29.