VDB-344707 · CVE-2026-23741 · GHSA-rvch-3jmx-3jf3

Asterisk PBX up to 23.2.1 ast_coredumper uncontrolled search path

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.8	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in Asterisk PBX up to 20.7-cert8/20.18.1/21.12.0/22.8.1/23.2.1. Affected by this vulnerability is an unknown functionality of the file asterisk/contrib/scripts/ast_coredumper. This manipulation causes uncontrolled search path. This vulnerability is tracked as CVE-2026-23741. The attack is restricted to local execution. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Asterisk PBX up to 20.7-cert8/20.18.1/21.12.0/22.8.1/23.2.1. It has been declared as critical. Affected by this vulnerability is some unknown processing of the file asterisk/contrib/scripts/ast_coredumper. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. The CWE definition for the vulnerability is CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2, the asterisk/contrib/scripts/ast_coredumper runs as root, as noted by the NOTES tag on line 689 of the ast_coredumper file. The script will source the contents of /etc/asterisk/ast_debug_tools.conf, which resides in a folder that is writeable by the asterisk user:group. Due to the /etc/asterisk/ast_debug_tools.conf file following bash semantics and it being loaded; an attacker with write permissions may add or modify the file such that when the root ast_coredumper is run; it would source and thereby execute arbitrary bash code found in the /etc/asterisk/ast_debug_tools.conf. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-23741 since 01/15/2026. The exploitation appears to be difficult. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1574 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 298273 (Linux Distros Unpatched Vulnerability : CVE-2026-23741), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 20.7-cert9, 20.18.2, 21.12.1, 22.8.2 or 23.2.2 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (298273) and CERT Bund (WID-SEC-2026-0327). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

Open Source Asterisk

Productinfo

Type

Communications System

Vendor

Asterisk

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔒

CNA Base Score: 1.8
CNA Vector (GitHub_M): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uncontrolled search path
CWE: CWE-427 / CWE-426
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 298273
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23741

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: PBX 20.7-cert9/20.18.2/21.12.1/22.8.2/23.2.2

Timelineinfo

01/15/2026 CVE reserved
02/06/2026 +22 days Advisory disclosed
02/06/2026 +0 days VulDB entry created
02/19/2026 +12 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-rvch-3jmx-3jf3
Status: Confirmed

CVE: CVE-2026-23741 (🔒)
GCVE (CVE): GCVE-0-2026-23741
GCVE (VulDB): GCVE-100-344707
CERT Bund: WID-SEC-2026-0327 - Asterisk: Mehrere Schwachstellen

Entryinfo

Created: 02/06/2026 21:15
Updated: 02/19/2026 00:37
Changes: 02/06/2026 21:15 (66), 02/07/2026 05:14 (7), 02/07/2026 09:22 (1), 02/07/2026 12:13 (2), 02/19/2026 00:37 (11)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.