CVE-2024-1019: owasp modsecurity modsecurity Improper Input Validation

Vulnerability summary

CVE-2024-1019 is a high (CVSS 8.6) Improper Input Validation vulnerability in owasp modsecurity modsecurity. EPSS estimates a 0.69% chance of exploitation in the next 30 days, higher than 51.7% of scored vulnerabilities.

Timeline

1. 30-01-2024
   PublishedVulnerability first disclosed.
2. 17-06-2025
   Last modifiedVulnerability information updated.

Description

ModSecurity / libModSecurity 3.0.0 to 3.0.11 is affected by a WAF bypass for path-based payloads submitted via specially crafted request URLs. ModSecurity v3 decodes percent-encoded characters present in request URLs before it separates the URL path component from the optional query string component. This results in an impedance mismatch versus RFC compliant back-end applications. The vulnerability hides an attack payload in the path component of the URL from WAF rules inspecting it. A back-end may be vulnerable if it uses the path component of request URLs to construct queries. Integrators and users are advised to upgrade to 3.0.12. The ModSecurity v2 release line is not affected by this vulnerability.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.