CVE-2022-39955
7.3 · HIGHOverview
CVE-2022-39955 is a high-severity vulnerability affecting owasp owasp_modsecurity_core_rule_set. It was published on September 20, 2022 and has a CVSS 3.1 base score of 7.3 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type "charset" names and therefore bypassing the configurable CRS Content-Type header "charset" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. 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.
Remediation
Check the references section for vendor advisories and patches from owasp. Update owasp_modsecurity_core_rule_set to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| owasp | owasp_modsecurity_core_rule_set | >= 3.0.0, < 3.2.2 | Affected |
References
Frequently Asked Questions
What is CVE-2022-39955?
CVE-2022-39955 is a high-severity vulnerability affecting owasp owasp_modsecurity_core_rule_set. It was published on September 20, 2022 and has a CVSS 3.1 base score of 7.3 (HIGH).
How severe is CVE-2022-39955?
This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2022-39955?
Check the references section for vendor advisories and patches from owasp. Update owasp_modsecurity_core_rule_set to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2022-39955?
CyberStrike's AI-powered security agents can automatically detect CVE-2022-39955 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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