What is the CVSS score of CVE-2025-49832?

CVE-2025-49832 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.2%.

Which versions of Asterisk are affected by CVE-2025-49832?

Organizations using versions should be aware of notable risk from CVE-2025-49832, a null pointer dereference vulnerability rated CVSS 6.5.

Is there a public PoC exploit available for CVE-2025-49832?

Yes, a public proof-of-concept exploit is available for CVE-2025-49832. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2025-49832?

Within 7 days: Identify affected systems running versions and apply vendor patches promptly. Monitor vendor channels for patch availability.

Asterisk CVE-2025-49832

MEDIUM

NULL Pointer Dereference (CWE-476)

2025-08-01 security-advisories@github.com

Denial Of Service Null Pointer Dereference Microsoft Asterisk Certified Asterisk Sangoma

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:04 vuln.today

PoC Detected

Aug 25, 2025 - 17:42 vuln.today

Public exploit code

CVE Published

Aug 01, 2025 - 18:15 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

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.

AnalysisAI

Asterisk is an open source private branch exchange and telephony toolkit. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as NULL Pointer Dereference (CWE-476), which allows attackers to crash the application by dereferencing a null pointer. 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 include: Sangoma Asterisk, Sangoma Certified Asterisk. Version information: through 22.5.0.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Check pointers before dereferencing. Use static analysis tools to detect null pointer paths.