Description
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_confirm
https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5j
Issue Tracking, Patch x_refsource_misc
https://github.com/asterisk/asterisk/pull/1407
Scores
CVSS v3
7.5
EPSS
0.0011
EPSS Percentile
28.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-253
Status
published
Products (1)
sangoma/asterisk
< 20.15.2
Published
Aug 28, 2025
Tracked Since
Feb 18, 2026