THREATPORT/VULNERABILITY/CVE-2025-63655
HIGH SEVERITY

CVE-2025-63655

Monkey vulnerability

CVSS
7.5
EPSS
7.4%
EPSS pct
94th
Exploited
No known
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.
Affected vendor
Monkey Project
Affected product
Monkey
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
  • CWE-476 — NULL Pointer Dereference
Published
2026-01-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 7.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 94% of all scored CVEs.

Check your external exposure to CVE-2025-63655

  • Confirm whether Monkey Project Monkey is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2025-63655.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2025-63655

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