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Vulnerability record · CVE-2024-1019 · published 30 January 2024

CVE-2024-1019: Owasp modsecurity improper input validation vulnerability

Owasp · Modsecurity

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.

8.6 CVSS 3.1 High EPSS 0.69% · top 49.2% CWE-20 · Improper input validation
8.6CVSS 3.1 base score
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://lists.fedoraproject.org/archives/list/[email protected]/message/34KDQNZE2RS3CWFG5654LNHKX
https://lists.fedoraproject.org/archives/list/[email protected]/message/K6ZGABPJK2JPVH2JDFHZ5LQLW
https://owasp.org/www-project-modsecurity/tab_cves#cve-2024-1019-2024-01-30 PatchVendor Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/34KDQNZE2RS3CWFG5654LNHKX
https://lists.fedoraproject.org/archives/list/[email protected]/message/K6ZGABPJK2JPVH2JDFHZ5LQLW
https://owasp.org/www-project-modsecurity/tab_cves#cve-2024-1019-2024-01-30 PatchVendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-1019), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.