Vulnerability CVE-2021-31878
Published: 2021-07-30

Description:
An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without SDP must be received after Asterisk has sent a BYE request.

Type:

CWE-617

 (Reachable Assertion)

CVSS2 => (AV:N/AC:L/Au:S/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4/10
2.9/10
8/10
Exploit range
Attack complexity
Authentication
Remote
Low
Single time
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Digium -> Asterisk 

 References:
https://downloads.digium.com/pub/security/AST-2021-007.html
http://seclists.org/fulldisclosure/2021/Jul/48
http://downloads.asterisk.org/pub/security/AST-2021-007.html
http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.html
https://issues.asterisk.org/jira/browse/ASTERISK-29381
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