CVE-2025-49832 - CVE House
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Status published Medium CVE-2025-49832

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2025-47779
Using malformed From header can forge identity with ";" or NULL in name portion
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CVE-2024-42491
A malformed Contact or Record-Route URI in an incoming SIP request can cause Asterisk to crash when res_resolver_unbound is used
Medium 5.7

Affected Vendor

Affected Software

asterisk
Vulnerable Versions:
< 18.26.3, >= 20.00.0, < 20.15.1, >= 21.00.0, < 21.10.1, >= 22.00.0, < 22.5.1, >= 20.7-cert6, < 20.7-cert7

Timeline

Official Publish: August 1st, 2025
Last Modified: August 1st, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-476

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1499.004 Application or System Exploitation
Impact
T1489 Service Stop
Impact
T1203 Exploitation for Client Execution
Execution
T1190 Exploit Public-Facing Application
Initial Access