CVE-2021-32558
If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (9.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 9.22% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-74
- Affected
- digium/asterisk · digium/certified asterisk · debian/debian linux
- Source
- cve@mitre.org
EPSS 9.2% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.htmlPatch, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/Jul/49Mailing List, Patch, Third Party Advisory
- https://downloads.asterisk.org/pub/security/AST-2021-008.htmlPatch, Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29392Exploit, Issue Tracking, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00005.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4999Third Party Advisory
- http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.htmlPatch, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2021/Jul/49Mailing List, Patch, Third Party Advisory
- https://downloads.asterisk.org/pub/security/AST-2021-008.htmlPatch, Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29392Exploit, Issue Tracking, Patch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00005.htmlMailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-4999Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.