Critical Security Update for modsecurity-apache: Addressing CVE-2025-48866
Summary
DLA-4212-1: modsecurity-apache - security update. Affects modsecurity-apache versions < 2.9.3-3+deb11u4. Fixed in 2.9.3-3+deb11u4. How to fix ↓
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Background
modsecurity-apache is an open-source web application firewall (WAF) designed to protect web applications from various attacks, including SQL injection, cross-site scripting (XSS), and other vulnerabilities. It operates as an Apache module, providing real-time monitoring and filtering of HTTP traffic. The recent vulnerability, CVE-2025-48866, poses a significant risk to users of this package, necessitating immediate attention.
Vulnerability Detail
CVE-2025-48866 is a security vulnerability identified in modsecurity-apache that could allow an attacker to exploit the system by bypassing security rules. This vulnerability arises from improper validation of input data, which can lead to unauthorized access or manipulation of sensitive information. The ramifications of this vulnerability are severe, as it could compromise the integrity and confidentiality of web applications relying on modsecurity-apache for protection.
How To Fix
Minimum fixed version
2.9.3-3+deb11u4
This is the first release that contains the fix.
sudo apt-get install --only-upgrade modsecurity-apacheTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can disable the affected security rules in modsecurity-apache until the update is applied. This can be done by modifying the configuration file (usually located at /etc/modsecurity/modsecurity.conf) and commenting out the specific rules that are vulnerable. However, this is not a permanent solution and should only be used until the package is updated.
Conclusion
The vulnerability CVE-2025-48866 in modsecurity-apache poses a significant risk to web applications. It is crucial for users to update to the patched version 2.9.3-3+deb11u4 to ensure their systems are secure. Temporary workarounds can be implemented, but they should not replace a proper update.
See every vulnerability recorded for modsecurity-apache →
FAQ
CVE-2025-48866 is a security vulnerability in modsecurity-apache that allows attackers to bypass security measures.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
Failing to update modsecurity-apache may leave your web applications vulnerable to attacks that exploit CVE-2025-48866, potentially leading to data breaches.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities using just a manifest file like package-lock.json.
If immediate updating is not possible, consider disabling the affected security rules as a temporary workaround until the update can be applied.
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