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Fencer Vulns
high 7.5

CVE-2021-32558 json

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 Certi…

published 2021-07-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19403

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.2%
EPSS 9.2% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

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.

Patch / fix

  • digium asterisk 13.38.3, 16.19.1, 17.9.4, 18.15.1
  • asterisk Debian 14 1:16.16.1~dfsg-2

debian advisories DEBIAN-CVE-2021-32558

  • asterisk Alpine 3.11 16.6.2-r1
  • asterisk Alpine 3.12 16.16.1-r1
  • asterisk Alpine 3.13 18.2.1-r2
  • asterisk Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 18.2.2-r2

alpine advisories ALPINE-CVE-2021-32558

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32558 updated cvss 7.5

asterisk: remote crash when using IAX2 channel driver may lead to DoS

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

9.22% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • issues.asterisk.org https://issues.asterisk.org/jira/browse/ASTERISK-29392 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.