CVE-2025-47947

CVE-2025-47947 affects ModSecurity up to v2.9.8, where a DoS can occur when the payload is application/json and a sanitiseMatchedBytes action is present. A patch was developed (pull request 3389) and is expected in v2.9.9; no public workarounds are listed. Related advisories confirm denial-of-ser...

CVE-2023-24021

CVE-2023-24021 affects ModSecurity’s handling of file uploads via the FILES_TMP_CONTENT collection, due to incorrect handling of '\0' bytes. The vulnerability can enable Web Application Firewall bypasses and buffer over-reads on the WAF when rules read FILES_TMP_CONTENT. Affected product: ModSecu...

CVE-2022-48279

CVE-2022-48279 affects ModSecurity; HTTP multipart requests could bypass the Web Application Firewall in versions before 2.9.6 and in 3.x before 3.0.8. Connected sources show patched releases (2.9.6+, 3.0.8+) and downstream updates (Debian, Fedora, Amazon Linux, etc.). No exploit details are prov...

CVE-2021-42717

CVE-2021-42717 affects ModSecurity 3.x up to 3.0.5 (and 2.x up to 2.9.4). The flaw: excessive nesting of JSON objects causes severe resource exhaustion (DoS), with small-ish requests (e.g., ~300 KB) able to tie up workers and consume CPU. Mitigations documented across multiple sources include upg...

CVE-2025-27110

Libmodsecurity3 contains a vulnerability in version 3.0.13 where encoded HTML entities with leading zeroes are not decoded correctly. A fixed release is 3.0.14. Several advisories (Fedora, openSUSE/SUSE, OpenVAS/NASL entries) reference CVE-2025-27110 and mandate/update to 3.0.14 to remediate. The...

CVE-2013-1915

CVE-2013-1915 (ModSecurity XXE) : ModSecurity before 2.7.3 is vulnerable to an XML External Entity (XXE) attack via an XML entity declaration and a referenced entity. This can allow remote attackers to read arbitrary files, make HTTP requests to intranet servers, or trigger denial of service (CPU...

CVE-2024-46292

CVE-2024-46292 reports a buffer overflow in ModSecurity v3.0.12 that could cause DoS via a crafted input in the name parameter. The description notes this is disputed by the supplier (cannot reproduce) and that documentation states it may not be usable with very large SecRequestBodyNoFilesLimit v...