---
title: "CVE-2017-5462\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-2017-5462?format=md
keywords: index, follow
---

# CVE-2017-5462

Publication date 20 April 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2017-5462?format=md#impact-score)

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## Description

A flaw in DRBG number generation within the Network Security Services (NSS)
library where the internal state V does not correctly carry bits over. The
NSS library has been updated to fix this issue to address this issue and
Firefox ESR 52.1 has been updated with NSS version 3.28.4. This
vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR <
52.1, and Firefox < 53.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-5462?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| firefox | 17.04 zesty | Fixed 53.0+build6-0ubuntu0.17.04.1 |
| 16.10 yakkety | Fixed 53.0+build6-0ubuntu0.16.10.1 |
| 16.04 LTS xenial | Fixed 53.0+build6-0ubuntu0.16.04.1 |
| 14.04 LTS trusty | Fixed 53.0+build6-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Ignored |
| nss | 17.04 zesty | Fixed 2:3.28.4-0ubuntu0.17.04.1 |
| 16.10 yakkety | Fixed 2:3.28.4-0ubuntu0.16.10.1 |
| 16.04 LTS xenial | Fixed 2:3.28.4-0ubuntu0.16.04.1 |
| 14.04 LTS trusty | Fixed 2:3.28.4-0ubuntu0.14.04.1 |
| 12.04 LTS precise | Ignored end of life |
| thunderbird | 17.04 zesty | Fixed 1:52.1.1+build1-0ubuntu0.17.04.1 |
| 16.10 yakkety | Fixed 1:52.1.1+build1-0ubuntu0.16.10.1 |
| 16.04 LTS xenial | Fixed 1:52.1.1+build1-0ubuntu0.16.04.1 |
| 14.04 LTS trusty | Fixed 1:52.1.1+build1-0ubuntu0.14.04.1 |
| 12.04 LTS precise | 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-2017-5462?format=md#patch-details)

## Notes

---

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

fixed for nss in precise after version upgrade

### 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:   <https://hg.mozilla.org/projects/nss/rev/7248d38b76e5> |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.3 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5462)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-5462)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-5462)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-5462)

### Related Ubuntu Security Notices (USN)

+ [USN-3278-1](https://usn.ubuntu.com/USN-3278-1)
+ Thunderbird vulnerabilities
+ 16 May 2017

+ [USN-3260-1](https://usn.ubuntu.com/USN-3260-1)
+ Firefox vulnerabilities
+ 21 April 2017

### Other references

* <https://www.mozilla.org/en-US/security/advisories/mfsa2017-10/#CVE-2017-5462>
* <https://www.cve.org/CVERecord?id=CVE-2017-5462>