CVE-2023-38199

Name: CVE-2023-38199
Creator: NVD / NIST
Published: 2023-07-13T03:15:10.023+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.63%

Last modified Jun 17, 2026

CVE-2023-38199 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not detect multiple Content-Type request headers on some platforms. This might allow attackers to bypass a WAF with a crafted payload, aka "Content-Type confusion" between the WAF and the backend application. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not detect multiple Content-Type request headers on some platforms. This might allow attackers to bypass a WAF with a crafted payload, aka "Content-Type confusion" between the WAF and the backend application. This occurs when the web application relies on only the last Content-Type header. Other platforms may reject the additional Content-Type header or merge conflicting headers, leading to detection as a malformed header.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.63%

45.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-843

Affected Software

Vendor	Product	Versions
Owasp	Coreruleset	<= 3.3.4

References

https://github.com/coreruleset/coreruleset/issues/3191Issue Tracking, Patch
https://github.com/coreruleset/coreruleset/pull/3237Issue Tracking
https://github.com/coreruleset/coreruleset/issues/3191Issue Tracking, Patch
https://github.com/coreruleset/coreruleset/pull/3237Issue Tracking

Timeline

Published: Jul 13, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-38199?

How severe is CVE-2023-38199?

CVE-2023-38199 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.

How do I fix CVE-2023-38199?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-38199?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST