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🛡️ CVE-2023-6780 — fedora

🟡 CVSS 5.3 — Medium ⚠️ Exploit Public CWE-131 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

An integer 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 these functions are called with a very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.

How this vulnerability can be exploited

This issue can be reached over the network, 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 none, integrity none, availability low.

CVSS metrics in full

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

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • 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: None.
  • Integrity impact: None.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2023-6780 is classified as CWE-131: Incorrect Buffer Size Calculation. The size computed for an allocation does not match what is later written into it, producing an overflow.

Affected software

CVE-2023-6780 is recorded against 2 packages.

  • fedora
  • glibc (from 2.37 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
seclists.org
access.redhat.com
bugzilla.redhat.com
lists.fedoraproject.org
lists.fedoraproject.org
security.gentoo.org
www.openwall.com
www.qualys.com
packetstormsecurity.com
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-131: Incorrect Buffer Size Calculation) in other software:

CVE-2023-6780 on other distributions

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

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-131
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 2.37 2.39

References

Exploit, Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2024/Feb/3
Exploit, Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2024/Feb/3

Similar Threats

Exploit Protection

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CVE-2023-6780 carries CVSS 5.3 Medium 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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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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