CVE-2017-17850

Name: CVE-2017-17850
Creator: NVD / NIST
Published: 2017-12-27T17:08:20.017+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 75.35%

Last modified Jun 17, 2026

CVE-2017-17850 is a vulnerability of currently unknown severity. 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. EPSS estimates a 75.35% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

75.35%

99.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions	Update
Digium	Asterisk	>= 13.0.0, <= 13.18.4	—
Digium	Asterisk	>= 14.0.0, <= 14.7.4	—
Digium	Asterisk	>= 15.0.0, <= 15.1.4	—
Digium	Certified Asterisk	13.1.0	—
Digium	Certified Asterisk	13.8	Cert1

References

http://downloads.asterisk.org/pub/security/AST-2017-014.htmlVendor Advisory
http://www.securitytracker.com/id/1040056Third Party Advisory, VDB Entry
https://issues.asterisk.org/jira/browse/ASTERISK-27480Issue Tracking, Vendor Advisory
https://security.gentoo.org/glsa/201811-11
http://downloads.asterisk.org/pub/security/AST-2017-014.htmlVendor Advisory
http://www.securitytracker.com/id/1040056Third Party Advisory, VDB Entry
https://issues.asterisk.org/jira/browse/ASTERISK-27480Issue Tracking, Vendor Advisory
https://security.gentoo.org/glsa/201811-11

Timeline

Published: Dec 27, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-17850?

How severe is CVE-2017-17850?

Severity scoring for CVE-2017-17850 is pending analysis. The EPSS model estimates a 75.35% probability of exploitation in the next 30 days.

How do I fix CVE-2017-17850?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-17850?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST