CVE-2020-35652

Name: CVE-2020-35652
Creator: NVD / NIST
Published: 2021-01-29T08:15:10.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.91%

Last modified Jun 17, 2026

CVE-2020-35652 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.91% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.91%

77.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Digium	Asterisk	< 13.38.0
Digium	Asterisk	>= 14.0, < 16.15.0
Digium	Asterisk	>= 17.0, < 17.9.0
Digium	Asterisk	>= 18.0, < 18.1.0

References

https://downloads.asterisk.org/pub/security/AST-2020-003.htmlVendor Advisory
https://downloads.asterisk.org/pub/security/AST-2020-004.htmlVendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29191Exploit, Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29219Vendor Advisory
https://downloads.asterisk.org/pub/security/AST-2020-003.htmlVendor Advisory
https://downloads.asterisk.org/pub/security/AST-2020-004.htmlVendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29191Exploit, Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29219Vendor Advisory

Timeline

Published: Jan 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-35652?

How severe is CVE-2020-35652?

CVE-2020-35652 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.91% probability of exploitation in the next 30 days.

How do I fix CVE-2020-35652?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-35652?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST