High severity7.5NVD Advisory· Published Feb 18, 2021· Updated Jun 17, 2026
CVE-2021-26717
CVE-2021-26717
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
17cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:*+ 12 more
- cpe:2.3:a:digium:certified_asterisk:16.8:-:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc2:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc3:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert1-rc4:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert2:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert3:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc1:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc2:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc3:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert4-rc4:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert4:*:*:*:*:*:*
- cpe:2.3:a:digium:certified_asterisk:16.8:cert5:*:*:*:*:*:*
- Sangoma/Asteriskdescription
Patches
Vulnerability mechanics
References
5- seclists.org/fulldisclosure/2021/Feb/58nvdMailing ListPatchThird Party Advisory
- issues.asterisk.org/jira/browse/ASTERISK-29203nvdIssue TrackingPatchVendor Advisory
- packetstormsecurity.com/files/161471/Asterisk-Project-Security-Advisory-AST-2021-002.htmlnvdThird Party Advisory
- downloads.asterisk.org/pub/security/nvdVendor Advisory
- downloads.asterisk.org/pub/security/AST-2021-002.htmlnvdVendor Advisory
News mentions
0No linked articles in our index yet.