Executive Summary

Name CVE-2021-26906 First vendor Publication 2021-02-18
Vendor Cve Last vendor Modification 2021-02-24

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Overall CVSS Score 5.9
Base Score 5.9 Environmental Score 5.9
impact SubScore 3.6 Temporal Score 5.9
Exploitabality Sub Score 2.2
Attack Vector Network Attack Complexity High
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:N/I:N/A:P)
Cvss Base Score 4.3 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26906

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-404 Improper Resource Shutdown or Release

CPE : Common Platform Enumeration

Application 929
Application 13

Sources (Detail)

Source Url
CONFIRM https://downloads.asterisk.org/pub/security/AST-2021-005.html
FULLDISC http://seclists.org/fulldisclosure/2021/Feb/61
MISC http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisor...

Alert History

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Date Informations
2021-05-04 14:07:13
  • Multiple Updates
2021-04-22 03:12:24
  • Multiple Updates
2021-03-26 12:38:23
  • Multiple Updates
2021-02-19 21:23:32
  • Multiple Updates
2021-02-19 05:23:02
  • Multiple Updates
2021-02-19 00:23:03
  • First insertion