Medium severity · published Feb 18, 2021
CVE-2021-26906
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…
5.9
CVSS
2.5%
EPSS
No
On KEV
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
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.5% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Asterisk · Digium
13.0.0 before 13.38.2; 16.0.0 before 16.16.1; 17.0.0 before 17.9.2; 18.0 before 18.2.1 · source: NVD
CA
Certified Asterisk · Digium
16.8; 16.8; 16.8; 16.8; 16.8; 16.8; +7 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26906
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-26906
Third Party Advisory
http://packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.html
Mailing List
http://seclists.org/fulldisclosure/2021/Feb/61
Vendor Advisory
https://downloads.asterisk.org/pub/security/
Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2021-005.html
Issue Tracking
https://issues.asterisk.org/jira/browse/ASTERISK-29196
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