---
title: "CVE-2016-4073\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-2016-4073?format=md
keywords: index, follow
---

# CVE-2016-4073

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

**9.8 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2016-4073?format=md#impact-score)

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## Description

Multiple integer overflows in the mbfl\_strcut function in
ext/mbstring/libmbfl/mbfl/mbfilter.c in PHP before 5.5.34, 5.6.x before
5.6.20, and 7.x before 7.0.5 allow remote attackers to cause a denial of
service (application crash) or possibly execute arbitrary code via a
crafted mb\_strcut call.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| php5 | 16.04 LTS xenial | Not in release |
| 15.10 wily | Fixed 5.6.11+dfsg-1ubuntu3.2 |
| 14.04 LTS trusty | Fixed 5.5.9+dfsg-1ubuntu4.16 |
| 12.04 LTS precise | Fixed 5.3.10-1ubuntu3.22 |
| php7.0 | 16.04 LTS xenial | Fixed 7.0.4-7ubuntu2.1 |
| 15.10 wily | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | 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-2016-4073?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 |
| --- | --- |
| php5 | * Upstream:   <https://git.php.net/?p=php-src.git;a=commit;h=64f42c73efc58e88671ad76b6b6bc8e2b62713e1> |
| php7.0 | * Upstream:   <https://git.php.net/?p=php-src.git;a=commit;h=64f42c73efc58e88671ad76b6b6bc8e2b62713e1> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.8 · Critical

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.8 · Critical |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4073)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-4073)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-4073)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-4073)

### Related Ubuntu Security Notices (USN)

+ [USN-2984-1](https://usn.ubuntu.com/USN-2984-1)
+ PHP vulnerabilities
+ 24 May 2016

### Other references

* <https://gist.github.com/smalyshev/d8355c96a657cc5dba70>
* <http://www.openwall.com/lists/oss-security/2016/04/11/7>
* <https://www.cve.org/CVERecord?id=CVE-2016-4073>