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Vulnerability record · CVE-2025-63655 · published 29 January 2026

CVE-2025-63655: Monkey-project monkey null pointer dereference vulnerability

Monkey Project · 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.

7.5 CVSS 3.1 High EPSS 8.6% · top 5.1% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score
8.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2025.md ExploitThird Party Advisory
https://github.com/monkey/monkey/issues/427 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2013-2159Monkey-project monkey improper authentication vulnerabilityMonkey HTTP Daemon: broken user name authenticationEPSS 2.8%7.5CVE-2025-63656Monkey-project monkey out-of-bounds read vulnerabilityAn out-of-bounds read in the header_cmp function (mk_server/mk_http_parser.c) of monkey commit f37e984 allows attackers to cause a Denial of Service …EPSS 1.2%7.5CVE-2025-63657Monkey-project monkey out-of-bounds read vulnerabilityAn out-of-bounds read in the mk_mimetype_find function (mk_server/mk_mimetype.c) of monkey commit f37e984 allows attackers to cause a Denial of Servi…EPSS 1.2%7.5CVE-2025-63658Monkey-project monkey stack-based buffer overflow vulnerabilityA 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 (D…EPSS 1.3%7.5CVE-2025-63649Monkey-project monkey out-of-bounds read vulnerabilityAn out-of-bounds read in the http_parser_transfer_encoding_chunked function (mk_server/mk_http_parser.c) of monkey commit f37e984 allows attackers to…EPSS 1.1%7.5CVE-2025-63650Monkey-project monkey out-of-bounds read vulnerabilityAn out-of-bounds read in the mk_ptr_to_buf in mk_core function (mk_memory.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (…EPSS 1.2%7.5CVE-2025-63651Monkey-project monkey use after free vulnerabilityA use-after-free in the mk_string_char_search function (mk_core/mk_string.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (…EPSS 1.1%7.5CVE-2025-63652Monkey-project monkey use after free vulnerabilityA use-after-free in the mk_http_request_end function (mk_server/mk_http.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (Do…EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2025-63655), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.