What’s Vulnerable › Vulnerabilities

CVE-2020-35776

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-18 · updated 2026-06-17
• Weakness: CWE-120

Description

A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.

Affected products

• Digium Asterisk: from 13.0.0 through 13.38.1; from 16.0.0 through 16.15.1; from 17.0.0 through 17.9.1; from 18.0 through 18.1.1

References

• http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
• http://seclists.org/fulldisclosure/2021/Feb/57
• https://downloads.asterisk.org/pub/security/AST-2021-001.html
• https://issues.asterisk.org/
• https://issues.asterisk.org/jira/browse/ASTERISK-29227
• http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
• http://seclists.org/fulldisclosure/2021/Feb/57
• https://downloads.asterisk.org/pub/security/AST-2021-001.html
• https://issues.asterisk.org/
• https://issues.asterisk.org/jira/browse/ASTERISK-29227

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