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CVE-2021-26906

Date: February 18, 2021

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.

Severity Score

Related Resources (9)

http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html
https://nvd.nist.gov/vuln/detail/CVE-2021-26906
https://downloads.asterisk.org/pub/security/
https://security.alpinelinux.org/vuln/CVE-2021-26906
http://seclists.org/fulldisclosure/2021/Feb/61
https://issues.asterisk.org/jira/browse/ASTERISK-29196
https://downloads.asterisk.org/pub/security/AST-2021-005.html
https://security-tracker.debian.org/tracker/CVE-2021-26906
https://www.mend.io/vulnerability-database/CVE-2021-26906

Severity Score

Weakness Type (CWE)

Improper Resource Shutdown or Release

CWE-404

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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