A use-after-free in the mk_string_char_search function (mk_core/mk_string.c) of monkey…
Priority MEDIUM 41CWE-416Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-416 and the CVSS impact.
Summary
A 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 (DoS) via sending a crafted HTTP request to the server.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0105 64th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:monkey-project:monkey:*:*:*:*:*:*:*:* | up to 1.8.5 | Vulnerable | Monkey-project |
- cpe:2.3:a:monkey-project:monkey:*:*:*:*:*:*:*:* Versions up to 1.8.5 Vulnerable ·Monkey-project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-63651
- 2026-10-03 Alias added: GHSA-p9xf-3w58-v7mw
References
More Monkey-project Monkey vulnerabilities
- TI-2025-39399 A NULL pointer dereference in the mk_http_range_parse function (mk_server/mk_http.c) of… CVSS 3.1HIGH 7.5
- TI-2013-03354 Stack-based buffer overflow in the mk_request_header_process function in mk_request.c in… CVSS 2.0MEDIUM 6.8
- TI-2013-01928 Monkey HTTP Daemon: broken user name authentication CVSS 3.1CRITICAL 9.8
- TI-2025-39402 A stack overflow in the mk_http_index_lookup function (mk_server/mk_http.c) of monkey… CVSS 3.1HIGH 7.5
- TI-2025-39401 An out-of-bounds read in the mk_mimetype_find function (mk_server/mk_mimetype.c) of… CVSS 3.1HIGH 7.5
- TI-2025-39400 An out-of-bounds read in the header_cmp function (mk_server/mk_http_parser.c) of monkey… CVSS 3.1HIGH 7.5
Sources
- CVE-2025-63651 · CVE Program
- CVE-2025-63651 · NVD
- FIRST EPSS
- GHSA-p9xf-3w58-v7mw · GitHub Advisory Database · CC BY 4.0
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