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CVE-2025-9648— Denial of Service in CivetWeb

Quick assessment

Affected
CivetWeb CivetWeb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CivetWeb是Civetweb开源的一个易于使用、功能强大、可嵌入 C/C++ 的 Web 服务器，具有可选的 CGI、SSL 和 Lua 支持。 CivetWeb存在安全漏洞，该漏洞源于mg_handle_form_request函数在解析包含空字节的特制HTTP POST请求时进入无限循环，可能导致拒绝服务攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.70% · P50

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-9648

Vulnerability Information
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Vulnerability Title
Denial of Service in CivetWeb
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
空字节或NULL字符转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
CivetWeb 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CivetWeb是Civetweb开源的一个易于使用、功能强大、可嵌入 C/C++ 的 Web 服务器，具有可选的 CGI、SSL 和 Lua 支持。 CivetWeb存在安全漏洞，该漏洞源于mg_handle_form_request函数在解析包含空字节的特制HTTP POST请求时进入无限循环，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
CivetWeb CivetWeb 1.10 ~ 1.16 -

II. Public POCs for CVE-2025-9648

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III. Intelligence Information for CVE-2025-9648

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IV. Related Vulnerabilities

Same product: CivetWeb
Same vendor: CivetWeb
Same weakness: CWE-158

V. Comments for CVE-2025-9648

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