---
title: "CVE-2023-6779\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2023-6779?format=md
keywords: index, follow
---

# CVE-2023-6779

Publication date 31 January 2024

Last updated 26 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2023-6779?format=md#impact-score)

Toggle side navigation

## Description

An off-by-one 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 these functions
are called with a message bigger than INT\_MAX bytes, leading to an
incorrect calculation of the buffer size to store the message, resulting in
an application crash. This issue affects glibc 2.37 and newer.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| eglibc | 24.04 LTS noble | Not in release |
| 23.10 mantic | Not in release |
| 22.04 LTS jammy | Not in release |
| 20.04 LTS focal | Not in release |
| 18.04 LTS bionic | Not in release |
| 16.04 LTS xenial | Not in release |
| 14.04 LTS trusty | Not affected |
| glibc | 24.04 LTS noble | Fixed 2.39-0ubuntu1 |
| 23.10 mantic | Fixed 2.38-1ubuntu6.1 |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2023-6779?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| glibc | * Upstream:   <https://sourceware.org/git/?p=glibc.git;a=commit;h=7e5a0c286da33159d47d0122007aac016f3e02cd> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6779)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2023-6779)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2023-6779)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2023-6779)

### Related Ubuntu Security Notices (USN)

+ [USN-6620-1](https://usn.ubuntu.com/USN-6620-1)
+ GNU C Library vulnerabilities
+ 1 February 2024

### Other references

* <https://www.qualys.com/2024/01/30/cve-2023-6246/syslog.txt>
* <https://www.cve.org/CVERecord?id=CVE-2023-6779>