CVE-2025-9648

HIGH EPSS 48.9%
Published Sep 29, 20259mo ago · Modified Jun 17, 20262w ago
8.7 CVSS 4.0
High
Find Similar
Published Sep 29, 2025 9mo ago
Last Modified Jun 17, 2026 2w ago

Description

A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests. This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.

CVSS Details

Base Score
8.7
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
48.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-158

References 4

  • cert.pl https://cert.pl/en/posts/2025/09/CVE-2025-9648
  • github.com https://github.com/civetweb/civetweb
  • github.com https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133
  • github.com https://github.com/civetweb/civetweb/issues/1348

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.