Resource exhaustion in CivetWeb - CVE-2025-9648
Published: November 24, 2025
Vulnerability identifier: #VU118725
CSH Severity: Medium
CVSS v4.0: 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:U/U:Green
CVE-ID: CVE-2025-9648
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: civetweb
Affected software:
CivetWeb
CivetWeb
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to application does not properly control consumption of internal resources when handling HTTP POST requests with a null byte in the payload within the mg_handle_form_request() function. A remote attacker can send a specially crafted HTTP request to the application and consume all available CPU resources, leading to a denial of service.
How to mitigate CVE-2025-9648
Install updates from vendor's website.