---
title: "CVE-2011-1951\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-2011-1951?format=md
keywords: index, follow
---

# CVE-2011-1951

Publication date 11 July 2011

Last updated 24 July 2024

---

Ubuntu priority

**Low**

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

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## Description

lib/logmatcher.c in Balabit syslog-ng before 3.2.4, when the global flag is
set and when using PCRE 8.12 and possibly other versions, allows remote
attackers to cause a denial of service (memory consumption) via a message
that does not match a regular expression.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2011-1951?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| syslog-ng | 13.10 saucy | Not affected |
| 13.04 raring | Not affected |
| 12.10 quantal | Not affected |
| 12.04 LTS precise | Not affected |
| 11.10 oneiric | Not affected |
| 11.04 natty | Ignored end of life |
| 10.10 maverick | Ignored end of life |
| 10.04 LTS lucid | Ignored end of life |
| 8.04 LTS hardy | Ignored end of life |

---

* [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-2011-1951?format=md#patch-details)

## Notes

---

### [sbeattie](https://launchpad.net/~sbeattie)

may not affect releases where libpcre3 is < 8.12

### 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 |
| --- | --- |
| syslog-ng | * Upstream:   <http://git.balabit.hu/?p=bazsi/syslog-ng-3.2.git;a=commitdiff;h=09710c0b105e579d35c7b5f6c66d1ea5e3a3d3ff;hp=21a455ecdf808cbd0c57428d1bd3f9feec58419e> * Upstream:   <http://git.balabit.hu/?p=bazsi/syslog-ng-3.1.git;a=commitdiff;h=35de55e53dd653c50c8da5daf41a99ab22e7e8aa> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1951)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-1951)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-1951)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2011-1951)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2011-1951>