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Vulnerabilities

Vulnerability · CVE-2023-6377

A flaw was found in xorg-server.

Published Dec 13, 2023 · catalog updated Nov 4, 2026 · enterprise linux eus

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

Check if you run it

No confirmed exploitation is on record for CVE-2023-6377. EPSS is 1.57%. Act only if a listed version of enterprise linux eus is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.57%
Remediation
Version ranges on file
Affected products
Debian:12 xorg-server · Debian:12 xwayland · Debian:13 xorg-server · Debian:13 xwayland · Debian:14 xorg-server · Debian:14 xwayland

A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

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.

  • Debian:12 xorg-server0 → 2:21.1.7-3+deb12u4
  • Debian:12 xwayland2:22.1.9-1, 2:23.1.0-1, 2:23.1.1-1
  • Debian:13 xorg-server0 → 2:21.1.10-1
  • Debian:13 xwayland0 → 2:23.2.3-1
  • Debian:14 xorg-server0 → 2:21.1.10-1
  • Debian:14 xwayland0 → 2:23.2.3-1
  • cpe debian/debian linux10.0
  • cpe debian/debian linux11.0
  • cpe debian/debian linux12.0
  • cpe redhat/enterprise linux eus9.2
  • cpe tigervnc/tigervncversion unspecified
  • cpe x.org/x server< 21.1.10
  • cpe x.org/xwayland< 23.2.3

How to fix CVE-2023-6377

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-2023-6377. EPSS is 1.57%. Act only if a listed version of enterprise linux eus is installed.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0; debian/debian linux 11.0; debian/debian linux 12.0; redhat/enterprise linux eus 9.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read. EPSS 1.57%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

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. Dec 13, 2023 · OpenSSF OSV / OSV Scanner

    Detected

    A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

  2. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    xorg-server fixed in 2:21.1.7-3+deb12u4; xorg-server fixed in 2:21.1.10-1; xorg-server fixed in 2:21.1.10-1; xwayland fixed in 2:23.2.3-1

  3. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    xorg-server fixed in 2:21.1.7-3+deb12u4

  4. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    xorg-server fixed in 2:21.1.10-1

  5. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    xwayland fixed in 2:23.2.3-1

  6. Oct 26, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

  7. Nov 4, 2026 · NIST NVD

    Updated

    A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

Sources

  • CVE.orgVulnerability recordCVE-2023-6377

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2023-6377

    A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is inv

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryDEBIAN-CVE-2023-6377
    osv.dev

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • NIST NVDNov 5, 2026
  • CVE.orgOct 27, 2026
  • OpenSSF OSV / OSV ScannerOct 26, 2026