---
title: "CVE-2016-2119\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-2016-2119?format=md
keywords: index, follow
---

# CVE-2016-2119

Publication date 7 July 2016

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2016-2119?format=md#impact-score)

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## Description

libcli/smb/smbXcli\_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11,
and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a
client-signing protection mechanism, and consequently spoof SMB2 and SMB3
servers, via the (1) SMB2\_SESSION\_FLAG\_IS\_GUEST or (2)
SMB2\_SESSION\_FLAG\_IS\_NULL flag.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2016-2119?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| samba | 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.1 |
| 15.10 wily | Ignored end of life |
| 14.04 LTS trusty | Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.1 |
| 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

---

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

workaround in upstream report

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2119)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2016-2119)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2016-2119)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2016-2119)

### Related Ubuntu Security Notices (USN)

+ [USN-3092-1](https://usn.ubuntu.com/USN-3092-1)
+ Samba vulnerability
+ 28 September 2016

### Other references

* <https://www.samba.org/samba/security/CVE-2016-2119.html>
* <https://www.cve.org/CVERecord?id=CVE-2016-2119>