CVE-2022-39958: Debian Linux

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass to sequentially exfiltrate small and undetectable sections of data by repeatedly submitting an HTTP Range header field with a small byte range. A restricted resource, access to which would ordinarily be detected, may be exfiltrated from the backend, despite being protected by a web application firewall that uses CRS. Short subsections of a restricted resource may bypass pattern matching techniques and allow undetected access. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively and to configure a CRS paranoia level of 3 or higher.

Affected products

• Debian Debian Linux: version 10.0 only
• Fedoraproject Fedora: version 35 only; version 36 only; version 37 only
• Owasp Owasp Modsecurity Core Rule Set: from 3.0.0, before 3.2.2 (fixed in 3.2.2); from 3.3.0, before 3.3.3 (fixed in 3.3.3)

Published 2022-09-20. Last modified 2026-06-17.