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Vulnerabilities

Vulnerability · CVE-2023-5367

A out-of-bounds write flaw was found in the xorg-x11-server.

Published Oct 25, 2023 · catalog updated Nov 4, 2026 · x server

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2023-5367. EPSS is 0.61%. Act only if a listed version of x server is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.61%
Remediation
Version ranges on file
Affected products
cpe redhat/enterprise linux · cpe redhat/enterprise linux desktop · cpe redhat/enterprise linux for ibm z systems · cpe redhat/enterprise linux for power big endian · cpe x.org/x server · cpe x.org/xwayland

A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe redhat/enterprise linux7.0
  • cpe redhat/enterprise linux8.0
  • cpe redhat/enterprise linux9.0
  • cpe redhat/enterprise linux desktop7.0
  • cpe redhat/enterprise linux for ibm z systems7.0_s390x
  • cpe redhat/enterprise linux for power big endian7.0_ppc64
  • cpe x.org/x server< 21.1.9
  • cpe x.org/xwayland< 23.2.2

How to fix CVE-2023-5367

  • Upgrade

    CVE-2023-5367 lists a fix boundary at 21.1.9. Compare the installed build with that boundary before you change production.

  • Version check

    Seen in 7.0 · 5 other packages on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-5367. EPSS is 0.61%. Act only if a listed version of x server is installed.

Which versions are affected?

Compare what you have installed with redhat/enterprise linux 7.0; redhat/enterprise linux 8.0; redhat/enterprise linux 9.0; redhat/enterprise linux desktop 7.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 0.61%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 25, 2023 · NIST NVD

    Detected

    A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

  2. Nov 4, 2026 · NIST NVD

    Updated

    A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

Sources

  • CVE.orgVulnerability recordCVE-2023-5367

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2023-5367

    A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrprope

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 5, 2026
  • NIST NVDNov 5, 2026