---
title: "CVE-2017-17850\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-2017-17850?format=md
keywords: index, follow
---

# CVE-2017-17850

Publication date 27 December 2017

Last updated 26 August 2025

---

Ubuntu priority

**Low**

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

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-17850?format=md#impact-score)

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## Description

An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older,
15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages
create a dialog in Asterisk. Those SIP messages must contain a contact
header. For those messages, if the header was not present and the PJSIP
channel driver was used, Asterisk would crash. The severity of this
vulnerability is somewhat mitigated if authentication is enabled. If
authentication is enabled, a user would have to first be authorized before
reaching the crash point.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| asterisk | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.10 oracular | Not affected |
| 24.04 LTS noble | Not affected |
| 23.10 mantic | Not affected |
| 23.04 lunar | Not affected |
| 22.10 kinetic | Not affected |
| 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Not affected |
| 18.10 cosmic | Not affected |
| 18.04 LTS bionic | Vulnerable |
| 17.10 artful | Ignored end of life |
| 17.04 zesty | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

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

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

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17850)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-17850)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-17850)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-17850)

### Other references

* <http://downloads.asterisk.org/pub/security/AST-2017-014.html>
* <https://issues.asterisk.org/jira/browse/ASTERISK-27480>
* <http://www.securitytracker.com/id/1040056>
* <https://www.cve.org/CVERecord?id=CVE-2017-17850>