Vulnerability Details CVE-2025-48866
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 33.5%
CVSS Severity
CVSS v3 Score 7.5
References
- https://github.com/owasp-modsecurity/ModSecurity/commit/3a54ccea62d3f7151bb08cb78d60c5e90b53ca2e
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-859r-vvv8-rm8r
- https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8pp7-cw2w
- https://github.com/owasp-modsecurity/ModSecurity/wiki/Reference-Manual-(v2.x)#sanitisearg
- https://lists.debian.org/debian-lts-announce/2025/06/msg00009.html
Products affected by CVE-2025-48866
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cpe:2.3:a:owasp:modsecurity:2.0.0
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cpe:2.3:a:owasp:modsecurity:2.0.1
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cpe:2.3:a:owasp:modsecurity:2.0.2
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cpe:2.3:a:owasp:modsecurity:2.0.3
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cpe:2.3:a:owasp:modsecurity:2.0.4
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cpe:2.3:a:owasp:modsecurity:2.1.0
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cpe:2.3:a:owasp:modsecurity:2.1.1
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cpe:2.3:a:owasp:modsecurity:2.1.2
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cpe:2.3:a:owasp:modsecurity:2.1.3
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cpe:2.3:a:owasp:modsecurity:2.1.4
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cpe:2.3:a:owasp:modsecurity:2.1.5
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cpe:2.3:a:owasp:modsecurity:2.1.6
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cpe:2.3:a:owasp:modsecurity:2.1.7
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cpe:2.3:a:owasp:modsecurity:2.2.0
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cpe:2.3:a:owasp:modsecurity:2.5.0
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cpe:2.3:a:owasp:modsecurity:2.5.1
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cpe:2.3:a:owasp:modsecurity:2.5.10
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cpe:2.3:a:owasp:modsecurity:2.5.11
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cpe:2.3:a:owasp:modsecurity:2.5.12
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cpe:2.3:a:owasp:modsecurity:2.5.13
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cpe:2.3:a:owasp:modsecurity:2.5.2
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cpe:2.3:a:owasp:modsecurity:2.5.3
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cpe:2.3:a:owasp:modsecurity:2.5.4
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cpe:2.3:a:owasp:modsecurity:2.5.5
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cpe:2.3:a:owasp:modsecurity:2.5.6
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cpe:2.3:a:owasp:modsecurity:2.5.7
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cpe:2.3:a:owasp:modsecurity:2.5.8
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cpe:2.3:a:owasp:modsecurity:2.5.9
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cpe:2.3:a:owasp:modsecurity:2.6.0
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cpe:2.3:a:owasp:modsecurity:2.6.1
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cpe:2.3:a:owasp:modsecurity:2.6.2
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cpe:2.3:a:owasp:modsecurity:2.6.3
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cpe:2.3:a:owasp:modsecurity:2.6.4
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cpe:2.3:a:owasp:modsecurity:2.6.5
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cpe:2.3:a:owasp:modsecurity:2.6.6
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cpe:2.3:a:owasp:modsecurity:2.6.7
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cpe:2.3:a:owasp:modsecurity:2.6.8
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cpe:2.3:a:owasp:modsecurity:2.7.0
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cpe:2.3:a:owasp:modsecurity:2.7.1
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cpe:2.3:a:owasp:modsecurity:2.7.2
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cpe:2.3:a:owasp:modsecurity:2.7.3
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cpe:2.3:a:owasp:modsecurity:2.7.4
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cpe:2.3:a:owasp:modsecurity:2.7.5
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cpe:2.3:a:owasp:modsecurity:2.7.6
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cpe:2.3:a:owasp:modsecurity:2.7.7
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cpe:2.3:a:owasp:modsecurity:2.8.0
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cpe:2.3:a:owasp:modsecurity:2.9.0
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cpe:2.3:a:owasp:modsecurity:2.9.1
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cpe:2.3:a:owasp:modsecurity:2.9.2
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cpe:2.3:a:owasp:modsecurity:2.9.3
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cpe:2.3:a:owasp:modsecurity:2.9.4
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cpe:2.3:a:owasp:modsecurity:2.9.5
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cpe:2.3:a:owasp:modsecurity:2.9.6