What’s Vulnerable › Vulnerabilities

CVE-2020-35652

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-01-29 · updated 2026-06-17

Description

An issue was discovered in res_pjsip_diversion.c in Sangoma Asterisk before 13.38.0, 14.x through 16.x before 16.15.0, 17.x before 17.9.0, and 18.x before 18.1.0. A crash can occur when a SIP message is received with a History-Info header that contains a tel-uri, or when a SIP 181 response is received that contains a tel-uri in the Diversion header.

Affected products

• Digium Asterisk: before 13.38.0; from 14.0 before 16.15.0; from 17.0 before 17.9.0; from 18.0 before 18.1.0 — fixed in 13.38.0, 16.15.0, 17.9.0, 18.1.0

How to fix

Upgrade to a fixed version: Digium Asterisk 13.38.0, 16.15.0, 17.9.0, 18.1.0. Check the vendor advisory for mitigations.

References

• https://downloads.asterisk.org/pub/security/AST-2020-003.html
• https://downloads.asterisk.org/pub/security/AST-2020-004.html
• https://issues.asterisk.org/jira/browse/ASTERISK-29191
• https://issues.asterisk.org/jira/browse/ASTERISK-29219
• https://downloads.asterisk.org/pub/security/AST-2020-003.html
• https://downloads.asterisk.org/pub/security/AST-2020-004.html
• https://issues.asterisk.org/jira/browse/ASTERISK-29191
• https://issues.asterisk.org/jira/browse/ASTERISK-29219

Get alerted when CVE-2020-35652 or the next vulnerability affects your stack