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CVE-2025-47947— ModSecurity Has Possible DoS Vulnerability

Quick assessment

Affected
owasp-modsecurity ModSecurity
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ModSecurity是OWASP ModSecurity开源的一个开源、跨平台的web应用程序防火墙（WAF）引擎。 ModSecurity 2.9.8及之前版本存在安全漏洞，该漏洞源于处理application/json内容类型时可能导致拒绝服务。

CVSS 7.5 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-47947

Vulnerability Information
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Vulnerability Title
ModSecurity Has Possible DoS Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions up to and including 2.9.8 are vulnerable to denial of service in one special case (in stable released versions): when the payload's content type is `application/json`, and there is at least one rule which does a `sanitiseMatchedBytes` action. A patch is available at pull request 3389 and expected to be part of version 2.9.9. No known workarounds are available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
循环内过多的平台资源消耗
Source: CVE Program / CVE List V5
Vulnerability Title
ModSecurity 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ModSecurity是OWASP ModSecurity开源的一个开源、跨平台的web应用程序防火墙（WAF）引擎。 ModSecurity 2.9.8及之前版本存在安全漏洞，该漏洞源于处理application/json内容类型时可能导致拒绝服务。
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
owasp-modsecurity ModSecurity <= 2.9.8 -

II. Public POCs for CVE-2025-47947

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5165 chars
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III. Intelligence Information for CVE-2025-47947

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IV. Related Vulnerabilities

Same product: ModSecurity
Same vendor: owasp-modsecurity
Same weakness: CWE-1050

V. Comments for CVE-2025-47947

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