ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a…
Priority LOW 26CWE-755Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
ModSecurity 3.x before 3.0.4 mishandles key-value pair parsing, as demonstrated by a "string index out of range" error and worker-process crash for a "Cookie: =abc" header.
Why it matters now
EPSS 0.01216 68th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:owasp:modsecurity:*:*:*:*:*:*:*:* | 3.0.0 to before 3.0.4 | Vulnerable | owasp-modsecurity |
- cpe:2.3:a:owasp:modsecurity:*:*:*:*:*:*:*:* Versions 3.0.0 to before 3.0.4 Vulnerable ·owasp-modsecurity
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2019-25043
- 2026-10-03 Alias added: GHSA-p89w-8r2h-7mjp
References
More owasp-modsecurity Modsecurity vulnerabilities
- TI-2026-37865 ModSecurity: Multipart form-data parser silently strips embedded line breaks from… CVSS 3.1HIGH 8.6
- 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-2025-31022 ModSecurity has possible DoS vulnerability in sanitiseArg action CVSS 3.1HIGH 7.5
- TI-2025-34348 ModSecurity's Insufficient Return Value Handling can Lead to XSS and Source Code Disclosure CVSS 4.0MEDIUM 6.9
- TI-2024-00942 WAF bypass of the ModSecurity v3 release line CVSS 3.1HIGH 8.6
Sources
- CVE-2019-25043 · CVE Program
- CVE-2019-25043 · NVD
- FIRST EPSS
- GHSA-p89w-8r2h-7mjp · GitHub Advisory Database · CC BY 4.0
- CVE-2019-25043 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences