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CVE-2025-63655

Monkey NULL pointer dereference

7.5 HIGHPublic exploitEPSS 8.56%
  1. Published29 Jan 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Monkey≤ 1.8.5

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2025-63655 being actively exploited?

CVE-2025-63655 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 8.56%.

How severe is CVE-2025-63655?

CVE-2025-63655 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 8.56% probability of exploitation.

Which products are affected by CVE-2025-63655?

Affected products include Monkey.

How do I fix CVE-2025-63655?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.