CVE-2021-26906 Information

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.

CVSS Vector

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

Reference

https://issues.asterisk.org/jira/browse/ASTERISK-29196 https://downloads.asterisk.org/pub/security/ https://downloads.asterisk.org/pub/security/AST-2021-005.html http://seclists.org/fulldisclosure/2021/Feb/61 http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.9