CVE-2026-57187
Published:October 26, 2026
Updated:November 04, 2026
Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, an authenticated attacker may cause a heap-use-after-free in "PJSIP TCP/SDP" handling by sending a "SIP INVITE" over a connection-oriented transport and disconnecting before Asterisk responds with the "200 OK". So far, the crash has only been reproduced when Asterisk is built with "Address Sanitizer", which detects the issue. "Address Sanitizer" is a development tool with significant performance overhead and, according to the maintainer, is not used in production systems. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.
Affected Packages
https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=23.0.0-rc1 <23.4.1Fix Suggestion:
Update to version 23.4.1https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=22.0.0-rc1 <22.10.1Fix Suggestion:
Update to version 22.10.1https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=certified-22.8-cert1-rc1 <certified-22.8-cert3Fix Suggestion:
Update to version certified-22.8-cert3https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=certified-18.9-cert4 <certified-20.7-cert11 || >=certified-20.7-cert1-rc1 <certified-20.7-cert11Fix Suggestion:
Update to version certified-20.7-cert11https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=13.2.0-rc1 <20.20.1 || >=14.0.0-beta1 <20.20.1 || >=15.0.0-beta1 <20.20.1 || >=16.0.0-rc1 <20.20.1 || >=17.0.0-rc1 <20.20.1 || >=18.0.0-rc1 <20.20.1 || >=19.0.0-rc1 <20.20.1 || >=20.0.0-rc1 <20.20.1Fix Suggestion:
Update to version 20.20.1https://github.com/asterisk/asterisk.git (GITHUB):
Affected version(s) >=21.0.0-rc1 <21.12.3Fix Suggestion:
Update to version 21.12.3Related Resources (17)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
EPSS
Base Score:
0.48