How severe is CVE-2025-47947?

CVE-2025-47947 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-47947 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-47947?

CVE-2025-47947 affects Trustwave Modsecurity. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-47947?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-47947 have an EU (EUVD) identifier?

Yes. CVE-2025-47947 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16086.

When was CVE-2025-47947 published?

CVE-2025-47947 was published on 2025-05-21 and last updated on 2026-06-17.

CVE-2025-47947

CVE-2025-47947 is a high-severity vulnerability in Trustwave Modsecurity with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1050.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16086
Weakness: CWE-1050
Affected product: Trustwave Modsecurity
Published: 2025-05-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-47947?: 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.
How severe is CVE-2025-47947?: CVE-2025-47947 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-47947 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-47947?: CVE-2025-47947 affects Trustwave Modsecurity. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-47947?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-47947 have an EU (EUVD) identifier?: Yes. CVE-2025-47947 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16086.
When was CVE-2025-47947 published?: CVE-2025-47947 was published on 2025-05-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*

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