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CVE-2026-23740— Asterisk vulnerable to potential privilege escalation

Quick assessment

Affected
asterisk asterisk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Asterisk是Asterisk开源的一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 20.7-cert9之前版本、20.18.2之前版本、21.12.1之前版本、22.8.2之前版本和23.2.2之前版本存在安全漏洞，该漏洞源于ast_coredumper将文件写入全局可写目录，可能导致执行任意命令或覆盖任意文件。

EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-23740

Vulnerability Information
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Vulnerability Title
Asterisk vulnerable to potential privilege escalation
Source: CVE Program / CVE List V5
Vulnerability Description
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, when ast_coredumper writes its gdb init and output files to a directory that is world-writable (for example /tmp), an attacker with write permission(which is all users on a linux system) to that directory can cause root to execute arbitrary commands or overwrite arbitrary files by controlling the gdb init file and output paths. This issue has been patched in versions 20.7-cert9, 20.18.2, 21.12.1, 22.8.2, and 23.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5
Vulnerability Title
Asterisk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Asterisk是Asterisk开源的一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk 20.7-cert9之前版本、20.18.2之前版本、21.12.1之前版本、22.8.2之前版本和23.2.2之前版本存在安全漏洞，该漏洞源于ast_coredumper将文件写入全局可写目录，可能导致执行任意命令或覆盖任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
asterisk asterisk < 23.2.2 -

II. Public POCs for CVE-2026-23740

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III. Intelligence Information for CVE-2026-23740

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Vendor Advisories for CVE-2026-23740 (1)

Same Patch Batch · asterisk · 2026-02-06 · 4 CVEs total

CVE-2026-23738 3.5 LOW The Asterisk embedded web server 's /httpstatus page echos user supplied values(cookie and
CVE-2026-23739 2.0 LOW Asterisk xml.c uses unsafe XML_PARSE_NOENT leading to potential XXE Injection
CVE-2026-23741 ast_coredumper running as root sources ast_debug_tools.conf from /etc/asterisk; potentiall

IV. Related Vulnerabilities

Same product: asterisk
Same vendor: asterisk
Same weakness: CWE-427

V. Comments for CVE-2026-23740

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