Resource exhaustion in CivetWeb - CVE-2025-9648
Published: November 24, 2025
Vulnerability identifier: #VU118725
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2025-9648
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
CivetWeb
Red Hat Advanced Cluster Security for Kubernetes
Fedora
civetweb
Red Hat Advanced Cluster Security for Kubernetes
Fedora
civetweb
How to mitigate CVE-2025-9648
Install updates from vendor's website.
Red Hat Advanced Cluster Security for Kubernetes - addressed in versions 4.7.9, 4.8.6, 4.9.1
civetweb - addressed in versions 1.16-10.el8, 1.16-10.el9, 1.16-10.el10_2, 1.16-10.fc41, 1.16-10.fc42
civetweb - addressed in versions 1.16-10.el8, 1.16-10.el9, 1.16-10.el10_2, 1.16-10.fc41, 1.16-10.fc42
External References
Related Security Bulletins
- Denial of service in CivetWeb
- Fedora EPEL 8 update for civetweb
- Fedora EPEL 9 update for civetweb
- Fedora EPEL 10.2 update for civetweb
- Fedora 41 update for civetweb
- Fedora 42 update for civetweb
- Red Hat Advanced Cluster Security 4.9 update for CivetWeb
- Multiple vulnerabilities in Red Hat Advanced Cluster Security (RHACS) 4.8
- Multiple vulnerabilities in Red Hat Advanced Cluster Security (RHACS) 4.7