CVE-2025-47780: cli_permissions.conf: deny option does not work for disallowing shell commands

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-05-22 · updated 2026-06-17
Weakness: CWE-78

Description

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, trying to disallow shell commands to be run via the Asterisk command line interface (CLI) by configuring `cli_permissions.conf` (e.g. with the config line `deny=!*`) does not work which could lead to a security risk. If an administrator running an Asterisk instance relies on the `cli_permissions.conf` file to work and expects it to deny all attempts to execute shell commands, then this could lead to a security vulnerability. Versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk fix the issue.

Affected products

asterisk: before 18.26.2; from 20.0.0 before 20.14.1; from 21.0.0 before 21.9.1; from 22.0.0 before 22.4.1 — fixed in 18.26.2, 20.14.1, 21.9.1, 22.4.1
Sangoma Certified Asterisk: before 18.9; 18.9, 18.9-cert1, 18.9-cert1-rc1, 18.9-cert10, 18.9-cert11, 18.9-cert12 (+17) — fixed in 18.9

How to fix

Upgrade to a fixed version: asterisk 18.26.2, 20.14.1, 21.9.1, 22.4.1; Sangoma Certified Asterisk 18.9. Check the vendor advisory for mitigations.

References

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