How severe is CVE-2025-63658?

CVE-2025-63658 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-63658 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-63658?

CVE-2025-63658 affects Monkey-project Monkey. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-63658?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-63658 have an EU (EUVD) identifier?

Yes. CVE-2025-63658 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206521.

When was CVE-2025-63658 published?

CVE-2025-63658 was published on 2026-01-29 and last updated on 2026-06-17.

CVE-2025-63658

CVE-2025-63658 is a high-severity vulnerability in Monkey-project Monkey with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206521
Weakness: CWE-121
Affected product: Monkey-project Monkey
Published: 2026-01-29
Last modified: 2026-06-17

Description

A stack overflow in the mk_http_index_lookup 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.

Frequently asked questions

What is CVE-2025-63658?: A stack overflow in the mk_http_index_lookup 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.
How severe is CVE-2025-63658?: CVE-2025-63658 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-63658 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-63658?: CVE-2025-63658 affects Monkey-project Monkey. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-63658?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-63658 have an EU (EUVD) identifier?: Yes. CVE-2025-63658 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206521.
When was CVE-2025-63658 published?: CVE-2025-63658 was published on 2026-01-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:monkey-project:monkey:*:*:*:*:*:*:*:*

More vulnerabilities in Monkey-project Monkey

CVE-2013-2159 — Critical (CVSS 9.8): Monkey HTTP Daemon: broken user name authentication
CVE-2025-63657 — High (CVSS 7.5): An out-of-bounds read in the mk_mimetype_find function (mk_server/mk_mimetype.c) of monkey commit f37e984 allows…
CVE-2025-63656 — High (CVSS 7.5): An out-of-bounds read in the header_cmp function (mk_server/mk_http_parser.c) of monkey commit f37e984 allows attackers…
CVE-2025-63655 — High (CVSS 7.5): A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of monkey commit f37e984 allows…
CVE-2025-63653 — High (CVSS 7.5): An out-of-bounds read in the mk_vhost_fdt_close function (mk_server/mk_vhost.c) of monkey commit f37e984 allows…
CVE-2025-63652 — High (CVSS 7.5): A use-after-free in the mk_http_request_end function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to…

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