CVEvulnerability
CVE-2021-26717
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-02-18
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Description
An issue was discovered in Sangoma Asterisk 16.x before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6. When re-negotiating for T.38, if the initial remote response was delayed just enough, Asterisk would send both audio and T.38 in the SDP. If this happened, and the remote responded with a declined T.38 stream, then Asterisk would crash.
Affected configurations
• digium asterisk (>= 16.0.0 < 16.16.1)
• digium asterisk (>= 17.0.0 < 17.9.2)
• digium asterisk (>= 18.0 < 18.2.1)
• digium certified asterisk 16.8
References
- http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Feb/58 Mailing List, Patch, Third Party Advisory
- https://downloads.asterisk.org/pub/security/ Vendor Advisory
- https://downloads.asterisk.org/pub/security/AST-2021-002.html Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29203 Issue Tracking, Patch, Vendor Advisory
- http://packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.html Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Feb/58 Mailing List, Patch, Third Party Advisory
- https://downloads.asterisk.org/pub/security/ Vendor Advisory
- https://downloads.asterisk.org/pub/security/AST-2021-002.html Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29203 Issue Tracking, Patch, Vendor Advisory