🛡️ CVE-2024-42491
🟡 CVSS 5.7 — Medium ✅ No Known Exploit CWE-252 NVD
5.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with `.1` or `[.1]`, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting `noload = res_resolver_unbound.so` in modules.conf, or set `rewrite_contact = yes` on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.

Details

Severity MEDIUM
CVSS Score 5.7
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
CWE CWE-252
Public Exploit ✅ No
Source NVD
Published 2024-09-05
Updated 2026-06-02
Modified 2025-11-03

Affected Packages

Software From version Fixed in
asterisk 21.0.0 21.4.3
certified-asterisk — —

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