ZDF
Sign inSign up

Vulnerabilities

Security fix · CVE-2025-47947

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx.

Published May 21, 2025 · catalog updated May 22, 2025 · ModSecurity

Check this week

CVE-2025-47947 is not in CISA KEV. FIRST estimates a 60.00% chance of exploitation in the next 30 days. Check whether you run ModSecurity.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
60.00%
Remediation
Advisory link
Affected products
vendor owasp-modsecurity ModSecurity ≤ 2.9.8

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 , and there is at least one rule which does a action. A patch is available at pull request 3389 and expected to be part of version 2.9.9. No known workarounds are available.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor owasp-modsecurity ModSecurity ≤ 2.9.8≤ 2.9.8

How to fix CVE-2025-47947

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-47947 is not in CISA KEV. FIRST estimates a 60.00% chance of exploitation in the next 30 days. Check whether you run ModSecurity.

Which versions are affected?

Compare what you have installed with owasp-modsecurity ModSecurity ≤ 2.9.8 ≤ 2.9.8. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 60.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Nginx security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 21, 2025 · EUVD

    Detected

    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 , and there is at least one rule which does a action. A patch is available at pull request 3389 and expected to be part of version 2

  2. May 22, 2025 · EUVD

    Updated

    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 , and there is at least one rule which does a action. A patch is available at pull request 3389 and expected to be part of version 2

Sources

  • CVE.orgVulnerability recordCVE-2025-47947

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2025-16086

    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 , and there

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog May 22, 2025. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.