---
title: "CVE-2016-4051\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-2016-4051?format=md
keywords: index, follow
---

# CVE-2016-4051

Publication date 25 April 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2016-4051?format=md#impact-score)

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## Description

Buffer overflow in cachemgr.cgi in Squid 2.x, 3.x before 3.5.17, and 4.x
before 4.0.9 might allow remote attackers to cause a denial of service or
execute arbitrary code by seeding manager reports with crafted data.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| squid3 | 16.04 LTS xenial | Fixed 3.5.12-1ubuntu7.2 |
| 15.10 wily | Fixed 3.3.8-1ubuntu16.3 |
| 14.04 LTS trusty | Fixed 3.3.8-1ubuntu6.8 |
| 12.04 LTS precise | Fixed 3.1.19-1ubuntu3.12.04.7 |

---

* [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-2016-4051?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 |
| --- | --- |
| squid3 | * Upstream:   <http://www.squid-cache.org/Versions/v3/3.2/changesets/SQUID-2016_5.patch> * Upstream:   <http://www.squid-cache.org/Versions/v3/3.3/changesets/SQUID-2016_5.patch> * Upstream:   <http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2016_5.patch> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4051)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-4051)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-4051)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-4051)

### Related Ubuntu Security Notices (USN)

+ [USN-2995-1](https://usn.ubuntu.com/USN-2995-1)
+ Squid vulnerabilities
+ 9 June 2016

### Other references

* <http://www.squid-cache.org/Advisories/SQUID-2016_5.txt>
* <https://marc.info/?l=oss-security&m=146116724827962&w=2>
* <https://www.cve.org/CVERecord?id=CVE-2016-4051>