# CVE-2024-42491: asterisk: Asterisk is an open-source private branch exchange (PBX)

CVE-2024-42491 is fixed in 69 products on 1 platform, first by DEBIAN-CVE-2024-42491, released September 5, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-42491
- Priority: Routine
- CVSS: 5.7 (medium)
- EPSS: 0.0058
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 5, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | asterisk Debian 14 | 1:20.9.3~dfsg+~cs6.14.60671435-1 | [DEBIAN-CVE-2024-42491](https://patchblox.com/security/data/fix/linux/debian-cve-2024-42491.md) | Sep 5, 2024 |
| Linux | asterisk Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-ael Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-ael-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-alembic Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-alsa Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-alsa-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-calendar Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-calendar-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-corosync Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-corosync-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-curl Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-curl-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-dahdi Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-dahdi-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-debugsource Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-devel Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-fax Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-fax-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-festival Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-festival-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-hep Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-hep-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-iax2 Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-iax2-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-ldap Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-ldap-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-lua Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-lua-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mgcp Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mgcp-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-minivm Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-minivm-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mobile Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mobile-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mwi-external Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mwi-external-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mysql Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-mysql-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-odbc Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-odbc-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-oss Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-oss-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-pjsip Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-pjsip-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-portaudio Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-portaudio-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-postgresql Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-postgresql-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-radius Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-radius-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-sip Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-sip-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-skinny Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-skinny-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-snmp Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-snmp-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-sqlite Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-sqlite-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-tds Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-tds-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-unistim Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-unistim-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-voicemail Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-voicemail-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-voicemail-odbc Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-voicemail-odbc-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-voicemail-plain Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |
| Linux | asterisk-voicemail-plain-debuginfo Fedora 43 | 18.26.4-1.fc43 | [FEDORA-2026-80B21DEBE7](https://patchblox.com/security/data/fix/linux/fedora-2026-80b21debe7.md) | Apr 11, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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