---
title: "CVE-2016-6210\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-2016-6210?format=md
keywords: index, follow
---

# CVE-2016-6210

Publication date 18 July 2016

Last updated 25 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-6210?format=md#impact-score)

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## Description

sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user
password hashing, uses BLOWFISH hashing on a static password when the
username does not exist, which allows remote attackers to enumerate users
by leveraging the timing difference between responses when a large password
is provided.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openssh | 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Fixed 1:7.2p2-4ubuntu2.1 |
| 15.10 wily | Ignored end of life |
| 14.04 LTS trusty | Fixed 1:6.6p1-2ubuntu2.8 |
| 12.04 LTS precise | Fixed 1:5.9p1-5ubuntu1.10 |

---

* [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-2016-6210?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 |
| --- | --- |
| openssh | * Upstream:   [?id=928](https://anongit.mindrot.org/openssh.git/commit/?id=9286875a73b2de7736b5e50692739d314cd8d9dc) * Upstream:   [?id=283](https://anongit.mindrot.org/openssh.git/commit/?id=283b97ff33ea2c641161950849931bd578de6946) * Upstream:   [?id=dbf](https://anongit.mindrot.org/openssh.git/commit/?id=dbf788b4d9d9490a5fff08a7b09888272bb10fcc) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

5.9 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.9 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6210)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-6210)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-6210)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-6210)

### Related Ubuntu Security Notices (USN)

+ [USN-3061-1](https://usn.ubuntu.com/USN-3061-1)
+ OpenSSH vulnerabilities
+ 15 August 2016

### Other references

* <http://seclists.org/fulldisclosure/2016/Jul/51>
* <https://www.cve.org/CVERecord?id=CVE-2016-6210>