---
title: "CVE-2016-1950\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-2016-1950?format=md
keywords: index, follow
---

# CVE-2016-1950

Publication date 8 March 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-2016-1950?format=md#impact-score)

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## Description

Heap-based buffer overflow in Mozilla Network Security Services (NSS)
before 3.19.2.3 and 3.20.x and 3.21.x before 3.21.1, as used in Mozilla
Firefox before 45.0 and Firefox ESR 38.x before 38.7, allows remote
attackers to execute arbitrary code via crafted ASN.1 data in an X.509
certificate.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Fixed 45.0+build2-0ubuntu0.15.10.1 |
| 14.04 LTS trusty | Fixed 45.0+build2-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 45.0+build2-0ubuntu0.12.04.1 |
| nss | 17.04 zesty | Fixed 2:3.21-1ubuntu4 |
| 16.10 yakkety | Fixed 2:3.21-1ubuntu4 |
| 16.04 LTS xenial | Fixed 2:3.21-1ubuntu4 |
| 15.10 wily | Fixed 2:3.21-0ubuntu0.15.10.2 |
| 14.04 LTS trusty | Fixed 2:3.21-0ubuntu0.14.04.2 |
| 12.04 LTS precise | Fixed 2:3.21-0ubuntu0.12.04.3 |
| thunderbird | 17.04 zesty | Fixed 1:38.8.0+build1-0ubuntu1 |
| 16.10 yakkety | Fixed 1:38.8.0+build1-0ubuntu1 |
| 16.04 LTS xenial | Fixed 1:38.7.2+build1-0ubuntu0.16.04.1 |
| 15.10 wily | Fixed 1:38.7.2+build1-0ubuntu0.15.10.1 |
| 14.04 LTS trusty | Fixed 1:38.7.2+build1-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Fixed 1:38.7.2+build1-0ubuntu0.12.04.1 |

---

* [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-2016-1950?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 |
| --- | --- |
| nss | * Upstream:   <http://hg.mozilla.org/projects/nss/rev/b9a31471759d> |

## 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-2016-1950)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-1950)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-1950)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-1950)

### Related Ubuntu Security Notices (USN)

+ [USN-2924-1](https://usn.ubuntu.com/USN-2924-1)
+ NSS vulnerability
+ 9 March 2016

+ [USN-2917-1](https://usn.ubuntu.com/USN-2917-1)
+ Firefox vulnerabilities
+ 9 March 2016

+ [USN-2934-1](https://usn.ubuntu.com/USN-2934-1)
+ Thunderbird vulnerabilities
+ 27 April 2016

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2016-35/>
* <https://www.cve.org/CVERecord?id=CVE-2016-1950>