CVE-2021-31878

An issue was discovered in PJSIP in Asterisk before 16.19.1 and before 18.5.1. To exploit, a re-INVITE without SDP must be received after Asterisk has sent a BYE request.

• CWE-617

• http://downloads.asterisk.org/pub/security/AST-2021-007.htmlPatch, Vendor Advisory
• http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.htmlPatch, Third Party Advisory, VDB Entry
• http://seclists.org/fulldisclosure/2021/Jul/48Mailing List, Patch, Third Party Advisory
• https://downloads.digium.com/pub/security/AST-2021-007.htmlPatch, Vendor Advisory
• https://issues.asterisk.org/jira/browse/ASTERISK-29381Exploit, Issue Tracking, Vendor Advisory
• http://downloads.asterisk.org/pub/security/AST-2021-007.htmlPatch, Vendor Advisory
• http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.htmlPatch, Third Party Advisory, VDB Entry
• http://seclists.org/fulldisclosure/2021/Jul/48Mailing List, Patch, Third Party Advisory
• https://downloads.digium.com/pub/security/AST-2021-007.htmlPatch, Vendor Advisory
• https://issues.asterisk.org/jira/browse/ASTERISK-29381Exploit, Issue Tracking, Vendor Advisory

Published

Jul 30, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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