CVE-2023-1393
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
02 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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.44% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 37.9% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2023-03-30 00:00Z3 YR AGO
- Last updated
- 2026-01-22 04:55Z9 MO AGO
- Reserved
- 2023-03-14
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.8)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-416Use After FreeVariant
- Data version
- 5.2
- Document digest
- 2e4f9984b82c3903b069a4c9800a3d32a948add24d6c820b5171eac8583aee34
05 Affected products
06 References
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2023/03/29/1
- lists.fedoraproject.orgFEDORA-2023-eb3c27ff25https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H3EVO3OQV6T4BSABWZ2TU3PY5TJTEQZ2/
- lists.fedoraproject.orgFEDORA-2023-b7835960achttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BPNQYHUI63DB5FHK6EOI3Z4C6YQZGZKI/
- lists.fedoraproject.orgFEDORA-2023-b87fd3a628https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SW2NRC3V53PIBXFPFBVWCOM2MDDILWQS/
- lists.fedoraproject.orgFEDORA-2023-f754e7abfdhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QHJMSMK7G4GPLMKIGKXIOL2RTKU5VFWE/
- lists.fedoraproject.orgFEDORA-2023-66d5af0278https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MEHSYYFGBN3G4RS2HJXKQ5NBMOAZ5F2F/
- lists.fedoraproject.orgFEDORA-2023-239bae4b57https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PSAAGI5V77FQXIT5PP4URP6BYQVCK5U5/
- lists.fedoraproject.orgFEDORA-2023-fe18ae3e85https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NOYATGGPMT3COC7ELAJW5TG2PVS3AFR2/
- lists.fedoraproject.orgFEDORA-2023-6f3f9ee721https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SWFUDSBSABRHQOX6TIQ5O3SNPFTPFQQP/
- security.gentoo.orgGLSA-202305-30https://security.gentoo.org/glsa/202305-30
- gitlab.freedesktop.orghttps://gitlab.freedesktop.org/xorg/xserver/-/commit/26ef545b3502f61ca722a7a3373507e88ef64110
07 Fixed in
AlmaLinux 8
- tigervnc Fixed in 1.12.0-9.el8_7.3
- tigervnc-icons Fixed in 1.12.0-9.el8_7.3
- tigervnc-license Fixed in 1.12.0-9.el8_7.3
- tigervnc-selinux Fixed in 1.12.0-9.el8_7.3
- tigervnc-server Fixed in 1.12.0-9.el8_7.3
- tigervnc-server-minimal Fixed in 1.12.0-9.el8_7.3
- tigervnc-server-module Fixed in 1.12.0-9.el8_7.3
- xorg-x11-server-Xdmx Fixed in 1.20.11-17.el8
- xorg-x11-server-Xephyr Fixed in 1.20.11-17.el8
- xorg-x11-server-Xnest Fixed in 1.20.11-17.el8
- xorg-x11-server-Xorg Fixed in 1.20.11-17.el8
- xorg-x11-server-Xvfb Fixed in 1.20.11-17.el8
- xorg-x11-server-Xwayland Fixed in 21.1.3-12.el8
- xorg-x11-server-common Fixed in 1.20.11-17.el8
- xorg-x11-server-devel Fixed in 1.20.11-17.el8
- xorg-x11-server-source Fixed in 1.20.11-17.el8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- tigervnc Fixed in 1.12.0-5.el9_1.2
- tigervnc-icons Fixed in 1.12.0-5.el9_1.2
- tigervnc-license Fixed in 1.12.0-5.el9_1.2
- tigervnc-selinux Fixed in 1.12.0-5.el9_1.2
- tigervnc-server Fixed in 1.12.0-5.el9_1.2
- tigervnc-server-minimal Fixed in 1.12.0-5.el9_1.2
- tigervnc-server-module Fixed in 1.12.0-5.el9_1.2
- xorg-x11-server-Xdmx Fixed in 1.20.11-19.el9
- xorg-x11-server-Xephyr Fixed in 1.20.11-19.el9
- xorg-x11-server-Xnest Fixed in 1.20.11-19.el9
- xorg-x11-server-Xorg Fixed in 1.20.11-19.el9
- xorg-x11-server-Xvfb Fixed in 1.20.11-19.el9
- xorg-x11-server-Xwayland Fixed in 22.1.9-2.el9
- xorg-x11-server-common Fixed in 1.20.11-19.el9
- xorg-x11-server-devel Fixed in 1.20.11-19.el9
- xorg-x11-server-source Fixed in 1.20.11-19.el9
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- tigervnc Fixed in 1.12.0-9.el8_7.3
- tigervnc-icons Fixed in 1.12.0-9.el8_7.3
- tigervnc-license Fixed in 1.12.0-9.el8_7.3
- tigervnc-selinux Fixed in 1.12.0-9.el8_7.3
- tigervnc-server Fixed in 1.12.0-9.el8_7.3
- tigervnc-server-minimal Fixed in 1.12.0-9.el8_7.3
- tigervnc-server-module Fixed in 1.12.0-9.el8_7.3
- xorg-x11-server-Xdmx Fixed in 1.20.11-17.el8
- xorg-x11-server-Xephyr Fixed in 1.20.11-17.el8
- xorg-x11-server-Xnest Fixed in 1.20.11-17.el8
- xorg-x11-server-Xorg Fixed in 1.20.11-17.el8
- xorg-x11-server-Xvfb Fixed in 1.20.11-17.el8
- xorg-x11-server-Xwayland Fixed in 21.1.3-12.el8
- xorg-x11-server-common Fixed in 1.20.11-17.el8
- xorg-x11-server-devel Fixed in 1.20.11-17.el8
- xorg-x11-server-source Fixed in 1.20.11-17.el8
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- tigervnc Fixed in 1.12.0-5.el9_1.2
- tigervnc-icons Fixed in 1.12.0-5.el9_1.2
- tigervnc-license Fixed in 1.12.0-5.el9_1.2
- tigervnc-selinux Fixed in 1.12.0-5.el9_1.2
- tigervnc-server Fixed in 1.12.0-5.el9_1.2
- tigervnc-server-minimal Fixed in 1.12.0-5.el9_1.2
- tigervnc-server-module Fixed in 1.12.0-5.el9_1.2
- xorg-x11-server-Xdmx Fixed in 1.20.11-19.el9
- xorg-x11-server-Xephyr Fixed in 1.20.11-19.el9
- xorg-x11-server-Xnest Fixed in 1.20.11-19.el9
- xorg-x11-server-Xorg Fixed in 1.20.11-19.el9
- xorg-x11-server-Xvfb Fixed in 1.20.11-19.el9
- xorg-x11-server-Xwayland Fixed in 22.1.9-2.el9
- xorg-x11-server-common Fixed in 1.20.11-19.el9
- xorg-x11-server-devel Fixed in 1.20.11-19.el9
- xorg-x11-server-source Fixed in 1.20.11-19.el9
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- xorg-server Fixed in 2:21.1.7-2
- xwayland Fixed in 2:22.1.9-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- xorg-server Fixed in 2:21.1.7-2
- xwayland Fixed in 2:22.1.9-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- xorg-server Fixed in 2:21.1.7-2
- xwayland Fixed in 2:22.1.9-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- tigervnc No fix yet
- xorg-server Fixed in 2:1.19.6-1ubuntu4.15
- xorg-server-hwe-18.04 Fixed in 2:1.20.8-2ubuntu2.2~18.04.11
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- tigervnc Fixed in 1.10.1+dfsg-3ubuntu0.20.04.1
- xorg-server Fixed in 2:1.20.13-1ubuntu1~20.04.8
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- tigervnc Fixed in 1.12.0+dfsg-4ubuntu0.22.04.1
- xorg-server Fixed in 2:21.1.3-2ubuntu2.9
- xwayland Fixed in 2:22.1.1-1ubuntu0.6
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- xorg-server No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- xorg-server No fix yet
- xorg-server-hwe-16.04 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.