CVE-2025-49832: asterisk Null Dereference

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.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
sangoma	asterisk	< 18.26.3
sangoma	asterisk	20.0.0 — 20.15.1
sangoma	asterisk	21.0.0 — 21.10.1
sangoma	asterisk	22.0.0 — 22.5.1
sangoma	certified_asterisk	< 18.9
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All
sangoma	certified_asterisk	All

References

Advisories & Patches

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

Exploits

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

Frequently Asked Questions

What is CVE-2025-49832? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-49832? +

CVE-2025-49832 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-49832? +

CVE-2025-49832 affects products from sangoma, specifically: asterisk, certified_asterisk. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-49832? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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