What is the CVSS score of CVE-2025-63655?

CVE-2025-63655 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.9%.

Which versions of Monkey are affected by CVE-2025-63655?

A high-severity vulnerability in the Monkey web server can be exploited to crash the service through specially crafted HTTP requests, causing service unavailability for dependent applications and…

Is there a public PoC exploit available for CVE-2025-63655?

Yes, a public proof-of-concept exploit is available for CVE-2025-63655. Prioritise patching immediately. EPSS: 0.9%.

How to fix or mitigate CVE-2025-63655?

Within 24 hours: Identify and inventory all systems running affected Monkey versions and assess business criticality; implement WAF rules to block malformed HTTP range requests as interim protection. Within 7 days: Deploy network segmentation to restrict access to Monkey services; establish monitoring for exploitation attempts; evaluate migration to alternative web servers or patched versions if available. Within 30 days: Complete migration away from vulnerable Monkey instances or apply vendor patch once released; validate remediation through penetration testing.

Monkey CVE-2025-63655

HIGH

NULL Pointer Dereference (CWE-476)

2026-01-29 cve@mitre.org

Denial Of Service Null Pointer Dereference Monkey

7.5

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:00 vuln.today

PoC Detected

Feb 13, 2026 - 20:34 vuln.today

Public exploit code

CVE Published

Jan 29, 2026 - 20:16 nvd

HIGH 7.5

DescriptionNVD

A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

AnalysisAI

Technical ContextAI

Classified as CWE-476 (NULL Pointer Dereference). Affects the mk_http_range_parse component of Monkey. A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

CVE-2025-63655 vulnerability details – vuln.today

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Monkey CVE-2025-63655

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code