CVE-2025-49832

Asterisk is Vulnerable to Remote DoS and possible RCE Attacks During Memory Allocation

State: Published
Severity: 6.5 Medium
Published: Aug 1, 2025
Updated: Aug 1, 2025
Reserved: Jun 11, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
asteriskasterisk	< 18.26.3Affected >= 20.00.0, < 20.15.1Affected >= 21.00.0, < 21.10.1Affected >= 22.00.0, < 22.5.1Affected >= 20.7-cert6, < 20.7-cert7Affected

References

https://github.com/asterisk/asterisk/security/advisories/GHSA-mrq5-74j5-f5cr

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