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CVE-2023-38199

coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not block multiple Content...

9.8 CriticalFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.75%Up 0.7 points since Jul 14, 2023
90%50%10%1%

What each source reports

NVD Score used 9.8

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.

Record
CVE-2023-38199
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-843
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2023-38199
Updated
2026-11-02
EUVDEUVD-2023-42021 No score

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.

Record
EUVD-2023-42021
Updated
2026-11-03
GitHub AdvisoriesGHSA-662c-vg67-m327 9.8

coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not block multiple Content...

coreruleset (aka OWASP ModSecurity Core Rule Set) through 3.3.4 does not block multiple Content-Type headers, which might allow attackers to bypass a WAF with a crafted payload, aka "Content-Type confusion." This occurs when the web application relies on only the last Content-Type header.

Record
GHSA-662c-vg67-m327
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-843
Updated
2026-11-02
OSVDEBIAN-CVE-2023-38199 9.8

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.

Record
DEBIAN-CVE-2023-38199
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2023-38199 9.8

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.

Record
UBUNTU-CVE-2023-38199
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSV No score

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.

Record
CVE-2023-38199
Updated
2026-11-02
OSVopenSUSE-SU-2024:13187-1 No score

owasp-modsecurity-crs-3.3.5-1.1 on GA media

These are all security issues fixed in the owasp-modsecurity-crs-3.3.5-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:13187-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
modsecurity-crs
Debian:12
before 3.3.4-1+deb12u2, plus listed versions
3.3.4-13.3.4-1+deb12u1
3.3.4-1+deb12u2
modsecurity-crs
Debian:13
before 3.3.5-1
3.3.5-1
modsecurity-crs
Debian:14
before 3.3.5-1
3.3.5-1
modsecurity-crs
Debian:11
before 3.3.4-1~deb11u2, plus listed versions
3.3.0-13.3.0-1+deb11u13.3.2-13.3.4-1~deb11u1
3.3.4-1~deb11u2
modsecurity-crs
Ubuntu:16.04:LTS
All versions, plus listed versions
2.2.9-1
None known
modsecurity-crs
Ubuntu:18.04:LTS
All versions, plus listed versions
3.0.0-33.0.2-1
None known
modsecurity-crs
Ubuntu:20.04:LTS
All versions, plus listed versions
3.1.1-13.2.0-1
None known
modsecurity-crs
Ubuntu:22.04:LTS
All versions, plus listed versions
3.3.0-13.3.2-1
None known
modsecurity-crs
Ubuntu:24.04:LTS
All versions, plus listed versions
3.3.5-13.3.5-2
None known
modsecurity-crs
Ubuntu:25.10
All versions, plus listed versions
3.3.7-1
None known
modsecurity-crs
Ubuntu:26.10
All versions, plus listed versions
3.3.8-13.3.9-1
None known
modsecurity-crs
Ubuntu:26.04:LTS
All versions, plus listed versions
3.3.7-13.3.8-1
None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-38199 is a critical vulnerability (CVSS 9.8) in Owasp Coreruleset, published July 13, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.75%, the 55th percentile. Fixed in modsecurity-crs 3.3.4-1+deb12u2.

References

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