---
title: "CVE-2016-0771\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-2016-0771?format=md
keywords: index, follow
---

# CVE-2016-0771

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

**5.9 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2016-0771?format=md#impact-score)

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## Description

The internal DNS server in Samba 4.x before 4.1.23, 4.2.x before 4.2.9,
4.3.x before 4.3.6, and 4.4.x before 4.4.0rc4, when an AD DC is configured,
allows remote authenticated users to cause a denial of service
(out-of-bounds read) or possibly obtain sensitive information from process
memory by uploading a crafted DNS TXT record.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2016-0771?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| samba | 17.04 zesty | Fixed 2:4.3.6+dfsg-1ubuntu1 |
| 16.10 yakkety | Fixed 2:4.3.6+dfsg-1ubuntu1 |
| 16.04 LTS xenial | Fixed 2:4.3.6+dfsg-1ubuntu1 |
| 15.10 wily | Fixed 2:4.1.17+dfsg-4ubuntu3.3 |
| 14.04 LTS trusty | Fixed 2:4.1.6+dfsg-1ubuntu2.14.04.13 |
| 12.04 LTS precise | Not affected |
| samba4 | 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 15.10 wily | Not in release |
| 14.04 LTS trusty | Not in release |
| 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)

## Notes

---

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

4.0+ only

## 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 | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | Low |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

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

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-0771)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-0771)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-0771)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-0771)

### Related Ubuntu Security Notices (USN)

+ [USN-2922-1](https://usn.ubuntu.com/USN-2922-1)
+ Samba vulnerabilities
+ 8 March 2016

### Other references

* <https://www.samba.org/samba/security/CVE-2016-0771.html>
* <https://www.cve.org/CVERecord?id=CVE-2016-0771>