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CVE-2026-57203— Asterisk: Local privilege escalation through ast_loggrabber's world-writable helper location

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 是一款开源的专用分支交换机和电话系统工具包。在 Asterisk 20.20.1、21.12.3、22.10.1、23.4.1 以及认证版 Asterisk 20.7-cert11、22.8-cert3 之前的版本中，工具会从全局可写的目录执行 Python 脚本。若攻击者已获授权在 Asterisk 服务器上打开 shell 会话，其可将恶意脚本放置于该目录；当管理员以高权限用户身份运行时，攻击者便可借此提升权限或执行任意代码。该问题已在 Asterisk 20.20.1、21.12.3、

CVSS 6.9 · Medium Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1055.004 · Asynchronous Procedure Call T1548.001 · Setuid and Setgid

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Vulnerability Information

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Vulnerability Title

Asterisk: Local privilege escalation through ast_loggrabber's world-writable helper location

Source: CVE Program / CVE List V5

Vulnerability Description

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, `ast_loggrabber` executes a `Python script` from the world-writable `/tmp` directory. An attacker already authorized to open a shell session on the Asterisk server may place a malicious script there and gain elevated privileges or execute code when an administrator runs `ast_loggrabber` as a user with elevated privileges. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

不可信的搜索路径

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
asterisk	asterisk	< 20.20.1	-
asterisk	certified-asterisk	< 20.7-cert11	-

II. Public POCs for CVE-2026-57203

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-57203

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Vendor Pages for CVE-2026-57203 (7)

🔗 GitHub - asterisk/asterisk at 24.0.0-pre1 · GitHub x_refsource_MISC
🔗 Release Asterisk Release 23.4.1 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release 21.12.3 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release 20.20.1 · asterisk/asterisk · GitHub Read full article x_refsource_MISC
🔗 Release Asterisk Release 22.10.1 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release certified-22.8-cert3 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release certified-20.7-cert11 · asterisk/asterisk · GitHub x_refsource_MISC

Other References for CVE-2026-57203 (7)

https://github.com/asterisk/asterisk/security/advisories/GHSA-xgj6-2gc5-5x9c x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/bd63fe121d0e86867863bd98b5771e592273b035 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/ba8e5bdecd5280fc0ab230df59e41ea21b3a052f x_refsource_MISC
https://github.com/asterisk/asterisk/commit/f18ac4c964781f671e400342790bf40679698067 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/a51c4e3d6bccce4bc4226c43e78952573a62f165 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/022407ec47adebe27b7ec8bcf5626e5a02fe1551 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/c0fc2ae54cb6289a48a80333432f5fdf5a40c7de x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-57203

Same Patch Batch · asterisk · 2026-10-27 · 16 CVEs total

CVE-2026-57191	8.2 HIGH	Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing
CVE-2026-57202	8.1 HIGH	Asterisk: ARI setChannelVar bypasses live_dangerously and permits FILE() writes
CVE-2026-57197	7.7 HIGH	Asterisk: Heap Buffer Overflow in OGG/Speex File Playback (format_ogg_speex)
CVE-2026-57201	7.5 HIGH	Asterisk: Stack Buffer Overflow in H.323 ooTrace() via Unbounded vsprintf into Fixed 2048-
CVE-2026-57195	7.5 HIGH	Asterisk: NULL Pointer Dereference in HTTP AMI Digest Authentication
CVE-2026-57200	7.5 HIGH	Asterisk: ARI REST-over-WebSocket read-only bypass allows arbitrary module path load and c
CVE-2026-57186	7.5 HIGH	Asterisk: CVE-2022-37325 fix is absent from current chan_ooh323 Q.931 party-number parser
CVE-2026-57188	7.1 HIGH	Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handling
CVE-2026-57190	7.0 HIGH	Asterisk: SQL Injection in cel_pgsql and cel_tds via CELGenUserEvent eventtype Field
CVE-2026-57185	6.5 MEDIUM	Asterisk: Buffer over-read in Asterisk PJSIP MWI body parser
CVE-2026-57192	6.0 MEDIUM	Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
CVE-2026-57194	5.9 MEDIUM	Asterisk: chan_unistim DIALPAGE digit handling can overflow phone_number and crash Asteris
CVE-2026-57198	2.3 LOW	Asterisk: Possible RED T.140 Heap Buffer Overflow
CVE-2026-57189	2.3 LOW	Asterisk: Possible RED T.140 Generation Accumulation OOB Write
CVE-2026-57199	2.3 LOW	Asterisk: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct

IV. Related Vulnerabilities

Same product: asterisk

Same vendor: asterisk

Same weakness: CWE-426