CVE-2025-48866
HIGHDescription
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` - this is the same action but an alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service. Version 2.9.10 fixes the issue. As a workaround, avoid using rules that contain the `sanitiseArg` (or `sanitizeArg`) action.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Moderate risk: more likely to be exploited than 53% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1050 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-1390 | High | 7.5 | 5.1% | - | Fix |
| CVE-2019-11254 | Medium | 6.5 | 2.4% | - | Fix |
| CVE-2024-4068 | High | 7.5 | 1.5% | - | Fix |
| CVE-2021-41039 | High | 7.5 | 1.3% | - | Fix |
| CVE-2026-48779 | High | 7.5 | 0.8% | - | Fix |
| CVE-2025-32907 | Medium | 5.3 | 0.7% | - | Fix |
Common questions
How do I fix CVE-2025-48866?
Published advisories record a fix for 14 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2025-48866 being actively exploited?
Not that we know of. CVE-2025-48866 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.79% is the estimated probability that it will be exploited in the next 30 days. That is higher than 53% of all scored CVEs.
How severe is CVE-2025-48866?
CVE-2025-48866 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2025-48866 affect?
Published advisories record a fix for modsecurity-apache (Debian), mod_security (Red Hat / RHEL), mod_security (Rocky), mod_security-debuginfo (Rocky), and 10 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-07-02.