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TI-2025-30340 Aliases CVE-2025-47947

ModSecurity Has Possible DoS Vulnerability

Priority HIGH 72CWE-1050Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00599 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 11 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
owasp-modsecurityModSecurityup to 2.9.8—No fix listedCNA
  • ModSecurity Vendorowasp-modsecurity Affected up to 2.9.8 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*before 2.9.9VulnerableTrustwave
  • cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:* Versions before 2.9.9 Vulnerable ·Trustwave

Remediation

Red Hat 11 advisories

  • RHSA-2025:13681 Released 2025-08-14 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP1 security update
    • Red Hat JBoss Core Services 2.4.62.SP1
  • RHSA-2025:13680 Released 2025-08-14 · Red Hat rating Important
    Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP1 security update
    • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd-2.4.62-8.el7jbcs, jbcs-httpd24-httpd-devel-2.4.62-8.el7jbcs, jbcs-httpd24-httpd-manual-2.4.62-8.el7jbcs +12
    • Red Hat JBoss Core Services on RHEL 8 jbcs-httpd24-httpd-2.4.62-8.el8jbcs, jbcs-httpd24-httpd-devel-2.4.62-8.el8jbcs, jbcs-httpd24-httpd-manual-2.4.62-8.el8jbcs +12
  • RHSA-2025:8937 Released 2025-06-11 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) mod_security-2.9.6-1.el9_2.1, mod_security-mlogc-2.9.6-1.el9_2.1
Show 8 more Red Hat advisories
  • RHSA-2025:8917 Released 2025-06-11 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) mod_security-2.9.6-1.el9_4.1, mod_security-mlogc-2.9.6-1.el9_4.1
  • RHSA-2025:8922 Released 2025-06-11 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) mod_security-2.9.3-12.el9_0.1, mod_security-mlogc-2.9.3-12.el9_0.1
  • RHSA-2025:8837 Released 2025-06-11 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream (v. 9) mod_security-2.9.6-2.el9_6, mod_security-mlogc-2.9.6-2.el9_6
  • RHSA-2025:8844 Released 2025-06-11 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream (v. 8) mod_security-2.9.6-2.el8_10, mod_security-mlogc-2.9.6-2.el8_10
  • RHSA-2025:8674 Released 2025-06-09 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) mod_security-2.9.6-1.el8_8.1, mod_security-mlogc-2.9.6-1.el8_8.1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) mod_security-2.9.6-1.el8_8.1, mod_security-mlogc-2.9.6-1.el8_8.1
  • RHSA-2025:8627 Released 2025-06-09 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) mod_security-2.9.2-9.el8_4.1, mod_security-mlogc-2.9.2-9.el8_4.1
  • RHSA-2025:8626 Released 2025-06-09 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) mod_security-2.9.2-8.el8_2.1, mod_security-mlogc-2.9.2-8.el8_2.1
  • RHSA-2025:8605 Released 2025-06-05 · Red Hat rating Important
    mod_security security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) mod_security-2.9.2-9.el8_6.1, mod_security-mlogc-2.9.2-9.el8_6.1
    • Red Hat Enterprise Linux AppStream E4S (v.8.6) mod_security-2.9.2-9.el8_6.1, mod_security-mlogc-2.9.2-9.el8_6.1
    • Red Hat Enterprise Linux AppStream TUS (v.8.6) mod_security-2.9.2-9.el8_6.1, mod_security-mlogc-2.9.2-9.el8_6.1

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2025:8844
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2025:8837
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2025:8626
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2025:8627
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2025:8605
Red Hat Enterprise Linux AppStream E4S (v.8.6)Fixed RHSA-2025:8605
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2025:8674
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2025:8922
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2025:8937
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2025:8917
Red Hat Enterprise Linux AppStream TUS (v.8.6)Fixed RHSA-2025:8605
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2025:8674
Red Hat JBoss Core Services 2.4.62.SP1Fixed RHSA-2025:13681
Red Hat JBoss Core Services on RHEL 7 ServerFixed RHSA-2025:13680
Red Hat JBoss Core Services on RHEL 8Fixed RHSA-2025:13680
Not affected: 3 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-47947
  2. 2026-10-09 Fix available: RHSA-2025:13681 · Red Hat
  3. 2026-10-21 Fix available: Red Hat JBoss Core Services 2.4.62.SP1 · Red Hat

References

Exploit 1

Patch 1

  • TI-2026-37865 ModSecurity: Multipart form-data parser silently strips embedded line breaks from… CVSS 3.1HIGH 8.6
  • TI-2025-40548 FACTION Unauthenticated Custom Extension Upload leads to RCE CVSS 3.1CRITICAL 9.8
  • TI-2022-07517 Path Traversal in ESAPI CVSS 3.1CRITICAL 9.8
  • TI-2026-30581 ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators CVSS 4.0HIGH 8.2
  • TI-2026-23748 libModSecurity3 denial of service via segfault when using t:hexDecode on single-character query strings CVSS 4.0HIGH 8.2
  • TI-2025-19980 Libmodsecurity3 has possible bypass of encoded HTML entities CVSS 4.0HIGH 7.9
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences