synced 3 MIN AGO
01 Record

CVE-2023-6478

Xorg-x11-server: out-of-bounds memory read in rrchangeoutputproperty and rrchangeproviderproperty

HighPUBLISHEDCNA: redhat
CNA base score7.6 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
View raw JSON

02 Description

Xorg-x11-server: out-of-bounds memory read in rrchangeoutputproperty and rrchangeproviderproperty

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.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.61% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 75.6% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-23.
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
2023-12-13 06:27Z2 YR AGO
Last updated
2026-06-23 17:19Z4 MO AGO
Reserved
2023-12-04
Assigning CNA
redhat
Record state
PUBLISHED
Severity
High (CVSS 7.6)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
Weaknesses
  • CWE-190Integer Overflow or WraparoundBase
Data version
5.2
Document digest
1d3b45a68c8ecbc6fd1843b0015d0cafc8a0dc42dc882f660527da2c1ad41196

05 Affected products

VendorProductVersionsPlatforms
Red HatRed Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSIONNot specified—
Red HatRed Hat Enterprise Linux 7Not specified—
Red HatRed Hat Enterprise Linux 8Not specified—
Red HatRed Hat Enterprise Linux 8.2 Advanced Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.2 Telecommunications Update ServiceNot specified—
Red HatRed Hat Enterprise Linux 8.2 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update ServiceNot specified—
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP SolutionsNot specified—
Red HatRed Hat Enterprise Linux 8.6 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 8.8 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 9Not specified—
Red HatRed Hat Enterprise Linux 9.0 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 9.2 Extended Update SupportNot specified—
Red HatRed Hat Enterprise Linux 6Not specified—

06 References

07 Fixed in

AlmaLinux 8

  • tigervnc
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-icons
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-license
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-selinux
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-server
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-server-minimal
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-server-module
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • xorg-x11-server-Xdmx
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xephyr
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xnest
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xorg
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xvfb
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xwayland
    Fixed in 21.1.3-15.el8
  • xorg-x11-server-common
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-devel
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-source
    Fixed in 1.20.11-22.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 1.13.1-3.el9_3.3.alma.1
  • tigervnc-icons
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-license
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-selinux
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-server
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-server-minimal
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-server-module
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • xorg-x11-server-Xdmx
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xephyr
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xnest
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xorg
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xvfb
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xwayland
    Fixed in 22.1.9-5.el9
  • xorg-x11-server-common
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-devel
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-source
    Fixed in 1.20.11-24.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 1.13.1-2.el8_9.4.alma.1
  • tigervnc-icons
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-license
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-selinux
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-server
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-server-minimal
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • tigervnc-server-module
    Fixed in 1.13.1-2.el8_9.4.alma.1
  • xorg-x11-server-Xdmx
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xephyr
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xnest
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xorg
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xvfb
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-Xwayland
    Fixed in 21.1.3-15.el8
  • xorg-x11-server-common
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-devel
    Fixed in 1.20.11-22.el8
  • xorg-x11-server-source
    Fixed in 1.20.11-22.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 1.13.1-3.el9_3.3.alma.1
  • tigervnc-icons
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-license
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-selinux
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-server
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-server-minimal
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • tigervnc-server-module
    Fixed in 1.13.1-3.el9_3.3.alma.1
  • xorg-x11-server-Xdmx
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xephyr
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xnest
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xorg
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xvfb
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-Xwayland
    Fixed in 22.1.9-5.el9
  • xorg-x11-server-common
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-devel
    Fixed in 1.20.11-24.el9
  • xorg-x11-server-source
    Fixed in 1.20.11-24.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 2:21.1.7-3+deb12u3
  • xwayland
    No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • xorg-server
    Fixed in 2:21.1.10-1
  • xwayland
    Fixed in 2:23.2.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • xorg-server
    Fixed in 2:21.1.10-1
  • xwayland
    Fixed in 2:23.2.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • xorg-server
    Fixed in 2:1.20.13-1ubuntu1~20.04.12

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • xorg-server
    Fixed in 2:21.1.4-2ubuntu1.7~22.04.5
  • xwayland
    Fixed in 2:22.1.1-1ubuntu0.9

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 24.04 LTS

  • xorg-server
    Fixed in 2:21.1.10-1ubuntu1

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
    Fixed in 2:1.15.1-0ubuntu2.11+esm9
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

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
    Fixed in 2:1.18.4-0ubuntu0.12+esm8
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • 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.

Ubuntu Pro 18.04 LTS

  • xorg-server
    Fixed in 2:1.19.6-1ubuntu4.15+esm3
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • xorg-server-hwe-18.04
    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.