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🛡️ CVE-2023-6246 — fedora

🟠 CVSS 8.4 — High ⚠️ Exploit Public CWE-122 NVD
8.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

A heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when the openlog function was not called, or called with the ident argument set to NULL, and the program name (the basename of argv[0]) is bigger than 1024 bytes, resulting in an application crash or local privilege escalation. This issue affects glibc 2.36 and newer.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2023-6246 is classified as CWE-122: Heap-based Buffer Overflow. A write past the end of a heap allocation corrupts allocator metadata or neighbouring objects.

Affected software

CVE-2023-6246 is recorded against 2 packages.

  • fedora
  • glibc (from 2.36 up to 2.39)

Timeline and source

Published on 31 January 2024 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

packetstormsecurity.com
packetstormsecurity.com
seclists.org
seclists.org
access.redhat.com
bugzilla.redhat.com
lists.fedoraproject.org
lists.fedoraproject.org
security.gentoo.org
security.netapp.com
www.openwall.com
www.qualys.com
packetstormsecurity.com
packetstormsecurity.com
seclists.org
seclists.org
access.redhat.com
bugzilla.redhat.com
lists.fedoraproject.org
lists.fedoraproject.org
security.gentoo.org
security.netapp.com
www.openwall.com
www.qualys.com
cert-portal.siemens.com

Other advisories for this package

fedora has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-122: Heap-based Buffer Overflow) in other software:

CVE-2023-6246 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.4
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-122
Public Exploit ⚠️ Yes
Source NVD
Published 2024-01-31
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
fedora — —
glibc 2.36 2.39

References

Exploit, Third Party Advisory http://seclists.org/fulldisclosure/2024/Feb/3
Exploit, Third Party Advisory http://seclists.org/fulldisclosure/2024/Feb/5
Issue Tracking, Third Party Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2249053
Exploit, Mailing List, Third Party Advisory https://www.openwall.com/lists/oss-security/2024/01/30/6
Exploit, Third Party Advisory http://seclists.org/fulldisclosure/2024/Feb/3
Exploit, Third Party Advisory http://seclists.org/fulldisclosure/2024/Feb/5
Issue Tracking, Third Party Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2249053
Exploit, Mailing List, Third Party Advisory https://www.openwall.com/lists/oss-security/2024/01/30/6

Similar Threats

Exploit Protection

Are you running fedora?

CVE-2023-6246 carries CVSS 8.4 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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