A use-after-free in res_pjsip_pubsub.c in Sangoma Asterisk 16.28, 18.14, 19.6, and certified/18.9-cert2 may allow a remote authenticated attacker to crash Asterisk (denial of service) by performing activity on a subscription via a reliable transport at the same time that Asterisk is also performing activity on that subscription.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-98decbde87 advisory.

    Update to Asterisk 18.26.4, addressing numerous security vulnerabilities     accumulated since the long-stale 18.12.1 package. The following CVEs are fixed     in this update:

    - CVE-2022-26498 (fixed in 18.13.0): use-after-free in chan_ooh323
    - CVE-2022-42705 (fixed in 18.15.0): use-after-free in res_pjsip_pubsub
    - CVE-2022-37325 (fixed in 18.15.1): crash in H323 channel via malformed IE
    - CVE-2023-37457 (fixed in 18.20.0): buffer overflow in PJSIP_HEADER function
    - CVE-2023-49294 (fixed in 18.20.1): arbitrary file read via AMI GetConfig
    - CVE-2023-49786 (fixed in 18.20.1): DTLS race condition causing DoS
    - CVE-2024-35190 (fixed in 18.23.1): unauthorized SIP requests matched as endpoint
    - CVE-2024-42365 (fixed in 18.24.2): Write=originate allows code execution
    - CVE-2024-42491 (fixed in 18.25.0): crash via malformed Contact/Record-Route URI
    - CVE-2025-49832 (fixed in 18.26.3): DoS/RCE in res_stir_shaken
    - CVE-2025-47779 (fixed in 18.26.2): identity forging via malformed From header
    - CVE-2025-1131  (fixed in 18.26.3): local privilege escalation via safe_asterisk
    - CVE-2025-54995 (fixed in 18.26.4): resource exhaustion via RTP port leak

    Also fixes F44FailsToInstall for asterisk-snmp (BZ#2433748).

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-80b21debe7 advisory.

    Update to Asterisk 18.26.4, addressing numerous security vulnerabilities     accumulated since the long-stale 18.12.1 package. The following CVEs are fixed     in this update:

    - CVE-2022-26498 (fixed in 18.13.0): use-after-free in chan_ooh323
    - CVE-2022-42705 (fixed in 18.15.0): use-after-free in res_pjsip_pubsub
    - CVE-2022-37325 (fixed in 18.15.1): crash in H323 channel via malformed IE
    - CVE-2023-37457 (fixed in 18.20.0): buffer overflow in PJSIP_HEADER function
    - CVE-2023-49294 (fixed in 18.20.1): arbitrary file read via AMI GetConfig
    - CVE-2023-49786 (fixed in 18.20.1): DTLS race condition causing DoS
    - CVE-2024-35190 (fixed in 18.23.1): unauthorized SIP requests matched as endpoint
    - CVE-2024-42365 (fixed in 18.24.2): Write=originate allows code execution
    - CVE-2024-42491 (fixed in 18.25.0): crash via malformed Contact/Record-Route URI
    - CVE-2025-49832 (fixed in 18.26.3): DoS/RCE in res_stir_shaken
    - CVE-2025-47779 (fixed in 18.26.2): identity forging via malformed From header
    - CVE-2025-1131  (fixed in 18.26.3): local privilege escalation via safe_asterisk
    - CVE-2025-54995 (fixed in 18.26.4): resource exhaustion via RTP port leak

    Also fixes F44FailsToInstall for asterisk-snmp (BZ#2433748).

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-38d71393c1 advisory.

    Update to Asterisk 18.26.4, addressing numerous security vulnerabilities     accumulated since the long-stale 18.12.1 package. The following CVEs are fixed     in this update:

    - CVE-2022-26498 (fixed in 18.13.0): use-after-free in chan_ooh323
    - CVE-2022-42705 (fixed in 18.15.0): use-after-free in res_pjsip_pubsub
    - CVE-2022-37325 (fixed in 18.15.1): crash in H323 channel via malformed IE
    - CVE-2023-37457 (fixed in 18.20.0): buffer overflow in PJSIP_HEADER function
    - CVE-2023-49294 (fixed in 18.20.1): arbitrary file read via AMI GetConfig
    - CVE-2023-49786 (fixed in 18.20.1): DTLS race condition causing DoS
    - CVE-2024-35190 (fixed in 18.23.1): unauthorized SIP requests matched as endpoint
    - CVE-2024-42365 (fixed in 18.24.2): Write=originate allows code execution
    - CVE-2024-42491 (fixed in 18.25.0): crash via malformed Contact/Record-Route URI
    - CVE-2025-49832 (fixed in 18.26.3): DoS/RCE in res_stir_shaken
    - CVE-2025-47779 (fixed in 18.26.2): identity forging via malformed From header
    - CVE-2025-1131  (fixed in 18.26.3): local privilege escalation via safe_asterisk
    - CVE-2025-54995 (fixed in 18.26.4): resource exhaustion via RTP port leak

    Also fixes F44FailsToInstall for asterisk-snmp (BZ#2433748).

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - A use-after-free in res_pjsip_pubsub.c in Sangoma Asterisk 16.28, 18.14, 19.6, and certified/18.9-cert2     may allow a remote authenticated attacker to crash Asterisk (denial of service) by performing activity on     a subscription via a reliable transport at the same time that Asterisk is also performing activity on that     subscription. (CVE-2022-42705)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote host is affected by the vulnerability described in GLSA-202412-03 (Asterisk: Multiple Vulnerabilities)

    Multiple vulnerabilities have been discovered in Asterisk. Please review the CVE identifiers referenced     below for details.

Tenable has extracted the preceding description block directly from the Gentoo Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-3335 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-3335-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Markus Koschany     February 22, 2023                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : asterisk     Version        : 1:16.28.0~dfsg-0+deb10u2     CVE ID         : CVE-2022-23537 CVE-2022-23547 CVE-2022-31031 CVE-2022-37325                      CVE-2022-39244 CVE-2022-39269 CVE-2022-42705 CVE-2022-42706

    Multiple security vulnerabilities have been discovered in Asterisk, an Open     Source Private Branch Exchange. Buffer overflows and other programming errors     could be exploited for launching a denial of service attack or the execution of     arbitrary code.

    For Debian 10 buster, these problems have been fixed in version     1:16.28.0~dfsg-0+deb10u2.

    We recommend that you upgrade your asterisk packages.

    For the detailed security status of asterisk please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/asterisk

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: This is a digitally signed message part

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5358 advisory.

    Multiple security vulnerabilities have been discovered in Asterisk, an Open Source Private Branch     Exchange. Buffer overflows and other programming errors could be exploited for launching a denial of     service attack or the execution of arbitrary code. For the stable distribution (bullseye), these problems     have been fixed in version 1:16.28.0~dfsg-0+deb11u2. We recommend that you upgrade your asterisk packages.
    For the detailed security status of asterisk please refer to its security tracker page at:
    https://security-tracker.debian.org/tracker/asterisk

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 8dd438ed-a338-11ed-b48b-589cfc0f81b0 advisory.

  - In Sangoma Asterisk through 16.28.0, 17.x and 18.x through 18.14.0, and 19.x through 19.6.0, an incoming     Setup message to addons/ooh323c/src/ooq931.c with a malformed Calling or Called Party IE can cause a     crash. (CVE-2022-37325)

  - A use-after-free in res_pjsip_pubsub.c in Sangoma Asterisk 16.28, 18.14, 19.6, and certified/18.9-cert2     may allow a remote authenticated attacker to crash Asterisk (denial of service) by performing activity on     a subscription via a reliable transport at the same time that Asterisk is also performing activity on that     subscription. (CVE-2022-42705)

  - An issue was discovered in Sangoma Asterisk through 16.28, 17 and 18 through 18.14, 19 through 19.6, and     certified through 18.9-cert1. GetConfig, via Asterisk Manager Interface, allows a connected application to     access files outside of the asterisk configuration directory, aka Directory Traversal. (CVE-2022-42706)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
311158	Fedora 42 : asterisk (2026-98decbde87)	Nessus	Fedora Local Security Checks	high
311157	Fedora 43 : asterisk (2026-80b21debe7)	Nessus	Fedora Local Security Checks	high
311100	Fedora 44 : asterisk (2026-38d71393c1)	Nessus	Fedora Local Security Checks	high
252369	Linux Distros Unpatched Vulnerability : CVE-2022-42705	Nessus	Misc.	medium
212188	GLSA-202412-03 : Asterisk: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
171903	Debian dla-3335 : asterisk - security update	Nessus	Debian Local Security Checks	critical
171882	Debian DSA-5358-1 : asterisk - security update	Nessus	Debian Local Security Checks	critical
170965	FreeBSD : Asterisk -- multiple vulnerabilities (8dd438ed-a338-11ed-b48b-589cfc0f81b0)	Nessus	FreeBSD Local Security Checks	medium

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