---
title: "CVE-2015-20109\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-2015-20109?format=md
keywords: index, follow
---

# CVE-2015-20109

Publication date 25 June 2023

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2015-20109?format=md#impact-score)

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## Description

end\_pattern (called from internal\_fnmatch) in the GNU C Library (aka glibc
or libc6) before 2.22 might allow context-dependent attackers to cause a
denial of service (application crash), as demonstrated by use of the
fnmatch library function with the \*\*(!() pattern. NOTE: this is not the
same as CVE-2015-8984; also, some Linux distributions have fixed
CVE-2015-8984 but have not fixed this additional fnmatch issue.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| glibc | 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 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 |
| eglibc | 24.04 LTS noble | Not in release |
| 23.10 mantic | Not in release |
| 23.04 lunar | Not in release |
| 22.10 kinetic | 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 | Fixed 2.19-0ubuntu6.15+esm3  Ubuntu Pro |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

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## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.5 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.5 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-20109)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-20109)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-20109)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-20109)

### Related Ubuntu Security Notices (USN)

+ [USN-6762-1](https://usn.ubuntu.com/USN-6762-1)
+ GNU C Library vulnerabilities
+ 2 May 2024

### Other references

* <https://sourceware.org/bugzilla/show_bug.cgi?id=18036>
* <https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c2c6d39fab901c97c18fa3a3a3658d9dc3f7df61 (glibc-2.22)>
* <https://www.cve.org/CVERecord?id=CVE-2015-20109>