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Vulnerability record · CVE-2021-32558 · published 30 July 2021

CVE-2021-32558: Digium asterisk injection vulnerability

Digium · Asterisk

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.

7.5 CVSS 3.1 High EPSS 9.1% · top 4.9% CWE-74 · Injection
7.5CVSS 3.1 base score, v2 5.0
9.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.html PatchThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2021/Jul/49 Mailing ListPatchThird Party Advisory
https://downloads.asterisk.org/pub/security/AST-2021-008.html PatchVendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29392 ExploitIssue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00005.html Mailing ListThird Party Advisory
https://www.debian.org/security/2021/dsa-4999 Third Party Advisory
http://packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.html PatchThird Party AdvisoryVDB Entry
http://seclists.org/fulldisclosure/2021/Jul/49 Mailing ListPatchThird Party Advisory
https://downloads.asterisk.org/pub/security/AST-2021-008.html PatchVendor Advisory
https://issues.asterisk.org/jira/browse/ASTERISK-29392 ExploitIssue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2021/08/msg00005.html Mailing ListThird Party Advisory
https://www.debian.org/security/2021/dsa-4999 Third Party Advisory

Track CVE-2021-32558 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-32558), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.