What is the CVSS score of CVE-2025-54995?

CVE-2025-54995 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: 1.0%.

Which versions of Asterisk are affected by CVE-2025-54995?

Organizations using Asterisk should be aware of notable risk from CVE-2025-54995, a resource exhaustion vulnerability rated CVSS 6.5. Service availability could be impacted.. A patch is available.

Is there a public PoC exploit available for CVE-2025-54995?

Yes, a public proof-of-concept exploit is available for CVE-2025-54995. Prioritise patching immediately. EPSS: 1.0%.

How to fix or mitigate CVE-2025-54995?

Within 7 days: Identify affected systems and apply vendor patches promptly. Vendor patch is available.

Asterisk CVE-2025-54995

MEDIUM

Uncontrolled Resource Consumption (CWE-400)

2025-08-28 security-advisories@github.com

Denial Of Service Microsoft Asterisk Certified Asterisk

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 - 19:09 vuln.today

Patch released

Mar 28, 2026 - 19:09 nvd

Patch available

PoC Detected

Nov 03, 2025 - 18:17 vuln.today

Public exploit code

CVE Published

Aug 28, 2025 - 15:16 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 18.26.4 and 18.9-cert17, RTP UDP ports and internal resources can leak due to a lack of session termination. This could result in leaks and resource exhaustion. This issue has been patched in versions 18.26.4 and 18.9-cert17.

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.

Technical ContextAI

This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 18.26.4 and 18.9-cert17, RTP UDP ports and internal resources can leak due to a lack of session termination. This could result in leaks and resource exhaustion. This issue has been patched in versions 18.26.4 and 18.9-cert17. Affected products include: Sangoma Asterisk, Sangoma Certified Asterisk.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.