Release Date: | 2025-05-21 | |
Impact: | Important | What is this? |
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.
See more information about CVE-2025-47947 from MITRE CVE dictionary and NIST NVD
NOTE: The following CVSS metrics and score provided are preliminary and subject to review.
Base Score: | 7.5 |
Vector String: | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Version: | 3.1 |
Attack Vector: | Network |
Attack Complexity: | Low |
Privileges Required: | None |
User Interaction: | None |
Scope: | Unchanged |
Confidentiality Impact: | None |
Integrity Impact: | None |
Availability Impact: | High |
Platform | Errata | Release Date |
Oracle Linux version 8 (mod_security) | ELSA-2025-8844 | 2025-06-11 |
Oracle Linux version 9 (mod_security) | ELSA-2025-8837 | 2025-06-11 |
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