What’s Vulnerable › Vulnerabilities

CVE-2021-31878

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-30 · updated 2026-06-17
• Weakness: CWE-617

Description

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.

Affected products

• Digium Asterisk: 16.17.0, 16.18.0, 16.19.0, 18.3.0, 18.4.0, 18.5.0

References

• http://downloads.asterisk.org/pub/security/AST-2021-007.html
• http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.html
• http://seclists.org/fulldisclosure/2021/Jul/48
• https://downloads.digium.com/pub/security/AST-2021-007.html
• https://issues.asterisk.org/jira/browse/ASTERISK-29381
• http://downloads.asterisk.org/pub/security/AST-2021-007.html
• http://packetstormsecurity.com/files/163638/Asterisk-Project-Security-Advisory-AST-2021-007.html
• http://seclists.org/fulldisclosure/2021/Jul/48
• https://downloads.digium.com/pub/security/AST-2021-007.html
• https://issues.asterisk.org/jira/browse/ASTERISK-29381

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