CVE-2025-49832: Sangoma Asterisk

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Asterisk is an open source private branch exchange and telephony toolkit. In versions up to and including 18.26.2, between 20.00.0 and 20.15.0, 20.7-cert6, 21.00.0, 22.00.0 through 22.5.0, there is a remote DoS and possible RCE condition in `asterisk/res/res_stir_shaken /verification.c` that can be exploited when an attacker can set an arbitrary Identity header, or STIR/SHAKEN is enabled, with verification set in the SIP profile associated with the endpoint to be attacked. This is fixed in versions 18.26.3, 20.7-cert6, 20.15.1, 21.10.1 and 22.5.1.

Affected products

• Sangoma Asterisk: before 18.26.3 (fixed in 18.26.3); from 20.0.0, before 20.15.1 (fixed in 20.15.1); from 21.0.0, before 21.10.1 (fixed in 21.10.1); from 22.0.0, before 22.5.1 (fixed in 22.5.1)
• Sangoma Certified Asterisk: up to and including 18.9; version 20.7 only

Published 2025-08-01. Last modified 2026-06-17.