CVE-2021-32558

Name: CVE-2021-32558
Creator: NVD / NIST
Published: 2021-07-30T14:15:16.91+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 9.11%

Last modified Jun 17, 2026

CVE-2021-32558 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.. EPSS estimates a 9.11% chance of exploitation in the next 30 days.

Description

An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

9.11%

94.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-74

Affected Software

Vendor	Product	Versions
Digium	Asterisk	>= 13.0.0, < 13.38.3
Digium	Asterisk	>= 16.0.0, < 16.19.1
Digium	Asterisk	>= 17.0.0, < 17.9.4
Digium	Asterisk	>= 18.0.0, < 18.15.1
Digium	Certified Asterisk	16.8
Debian	Debian Linux	9.0
Debian	Debian Linux	11.0

References

http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.htmlPatch, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Jul/49Mailing List, Patch, Third Party Advisory
https://downloads.asterisk.org/pub/security/AST-2021-008.htmlPatch, Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29392Exploit, Issue Tracking, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00005.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2021/dsa-4999Third Party Advisory
http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.htmlPatch, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2021/Jul/49Mailing List, Patch, Third Party Advisory
https://downloads.asterisk.org/pub/security/AST-2021-008.htmlPatch, Vendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29392Exploit, Issue Tracking, Patch, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00005.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2021/dsa-4999Third Party Advisory

Timeline

Published: Jul 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32558?

How severe is CVE-2021-32558?

CVE-2021-32558 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 9.11% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32558?

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-2021-32558?

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

Scan your code now

Source: NVD / NIST