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CVE-2025-48866

Owasp Modsecurity vulnerability

7.5 HIGHPublic exploitEPSS 0.83%
  1. Published2 Jun 2025

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Owasp Modsecurity< 2.9.10

Remediation

Fixed in
Owasp Modsecurity≥ 2.9.10

References

Frequently asked

Is CVE-2025-48866 being actively exploited?

CVE-2025-48866 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.83%.

How severe is CVE-2025-48866?

CVE-2025-48866 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.83% probability of exploitation.

Which products are affected by CVE-2025-48866?

Affected products include Owasp Modsecurity.

How do I fix CVE-2025-48866?

Upgrade affected software to a fixed version, for example Owasp Modsecurity 2.9.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-48866 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.