CVE-2017-17850

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

75.4% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-12-27 17:08 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:11 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 75.4% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-12-27 17:08 UTC

Last modified

2026-06-17 01:11 UTC

Exploit probability

75.4% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Modified

Affected

• Digium Asterisk ≤ 13.18.4
• Digium Asterisk ≤ 14.7.4
• Digium Asterisk ≤ 15.1.4
• Digium Certified Asterisk 13.1.0
• Digium Certified Asterisk 13.8

Attack profile CVSS 3.0 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2017-17850.md and follow it. Check whether this project is affected by CVE-2017-17850. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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