CVE-2021-26906

MEDIUM

Asterisk 13.0.0-13.38.1, 14.x-16.16.0, 17.x-17.9.1, 18.x-18.2.0 DoS via SDP Negotiation

Title source: llm
STIX 2.1

Description

An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.

References (5)

Core 5
Core References
Vendor Advisory x_refsource_misc
https://downloads.asterisk.org/pub/security/
Mailing List, Patch, Third Party Advisory mailing-list x_refsource_fulldisc
http://seclists.org/fulldisclosure/2021/Feb/61
Issue Tracking, Patch, Vendor Advisory x_refsource_confirm
https://issues.asterisk.org/jira/browse/ASTERISK-29196

Scores

CVSS v3 5.9
EPSS 0.0255
EPSS Percentile 83.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-404
Status published
Products (2)
digium/asterisk 13.0.0 - 13.38.2
digium/certified_asterisk 16.8 (13 CPE variants)
Published Feb 18, 2021
Tracked Since Feb 18, 2026