CVE-2023-38199 json
coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not detect multiple Content-Type request headers on some platforms.
published 2023-07-13 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-42021
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- modsecurity-crs Debian 12 3.3.4-1+deb12u2
- modsecurity-crs Debian 14, Debian 13 3.3.5-1
debian advisories DEBIAN-CVE-2023-38199
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-24-046-15 updated cvss 9.8
Siemens SINEC NMS
-
Siemens SINEC NMS <V2.0_SP1affected: fixed in V2.0 support.industry.siemens.com
Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
0.75% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Classification
- Weakness
-
- CWE-843 Access of Resource Using Incompatible Type
References
-
github.com
/coreruleset/coreruleset/pull/3237
issue-tracking
-
github.com
/coreruleset/coreruleset/issues/3191
issue-tracking, patch
Sources
- CVE List CVE-2023-38199
- NVD CVE-2023-38199
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.