Medium severity5.9NVD Advisory· Published Feb 18, 2021· Updated Jun 17, 2026
CVE-2021-26906
CVE-2021-26906
Description
An issue was discovered in res_pjsip_session.c in Digium Asterisk through 13.38.1; 14.x, 15.x, and 16.x through 16.16.0; 17.x through 17.9.1; and 18.x through 18.2.0, and Certified Asterisk through 16.8-cert5. An SDP negotiation vulnerability in PJSIP allows a remote server to potentially crash Asterisk by sending specific SIP responses that cause an SDP negotiation failure.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16- Digium/Asteriskdescription
cpe: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:*:*:*:*:*:*
- 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:cert5:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
5- seclists.org/fulldisclosure/2021/Feb/61nvdMailing ListPatchThird Party Advisory
- issues.asterisk.org/jira/browse/ASTERISK-29196nvdIssue TrackingPatchVendor Advisory
- packetstormsecurity.com/files/161477/Asterisk-Project-Security-Advisory-AST-2021-005.htmlnvdThird Party Advisory
- downloads.asterisk.org/pub/security/nvdVendor Advisory
- downloads.asterisk.org/pub/security/AST-2021-005.htmlnvdVendor Advisory
News mentions
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