CVE-2019-25043

CVE-2019-25043 is a medium vulnerability published on May 6, 2021. 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.

CVE-2019-25043 was first published in the National Vulnerability Database on May 6, 2021, with the most recent update on July 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

CVE-2019-25043 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

CVE-2019-25043 has a CVSS v3 base score of 5.3 (NVD).

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-25043, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.