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01 Record

CVE-2021-4011

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to

UnratedPUBLISHEDCNA: redhat
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.60% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 48.8% 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
2021-12-17 00:00Z4 YR AGO
Last updated
2024-08-03 17:16Z2 YR AGO
Reserved
2021-11-23
Assigning CNA
redhat
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
Data version
5.1
Document digest
a6d1622b633bd57b20e285d13fa583ee83918e64c2e4fbde6707756fb568b21e

05 Affected products

VendorProductVersionsPlatforms
n/axorg-x11-serverxorg-x11-server 21.1.2, xorg-x11-server 1.20.14—

06 References

07 Fixed in

AlmaLinux 8

  • xorg-x11-server-Xdmx
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xephyr
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xnest
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xorg
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xvfb
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xwayland
    Fixed in 21.1.3-2.el8
  • xorg-x11-server-common
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.20.11-5.el8
    • Affected before 1.20.11-5.el8_6.2
  • xorg-x11-server-source
    Fixed in 1.20.11-5.el8

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Arch Linux

  • xorg-server
    Fixed in 21.1.2-1
  • xorg-xwayland
    Fixed in 21.1.4-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

  • xorg-x11-server-Xdmx
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xephyr
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xnest
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xorg
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xvfb
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-Xwayland
    Fixed in 21.1.3-2.el8
  • xorg-x11-server-common
    Fixed in 1.20.11-5.el8
  • xorg-x11-server-devel
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1.20.11-5.el8
    • Affected before 1.20.11-5.el8_6.2
  • xorg-x11-server-source
    Fixed in 1.20.11-5.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.

Debian 12

  • xorg-server
    Fixed in 2:1.20.13-3
  • xwayland
    Fixed in 2:21.1.4-1

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

Debian 13

  • xorg-server
    Fixed in 2:1.20.13-3
  • xwayland
    Fixed in 2:21.1.4-1

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

Debian 14

  • xorg-server
    Fixed in 2:1.20.13-3
  • xwayland
    Fixed in 2:21.1.4-1

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

Ubuntu 18.04 LTS

  • xorg-server
    Fixed in 2:1.19.6-1ubuntu4.10
  • xorg-server-hwe-18.04
    Fixed in 2:1.20.8-2ubuntu2.2~18.04.6

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

Ubuntu 20.04 LTS

  • xorg-server
    Fixed in 2:1.20.13-1ubuntu1~20.04.2

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 2:1.20.13-1ubuntu2
  • xwayland
    Fixed in 2:21.1.3-1ubuntu1

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+esm5
    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+esm1
    Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
  • xorg-server-hwe-16.04
    Fixed in 2:1.19.6-1ubuntu4.1~16.04.6+esm5
    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.

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.