9.8

CVE-2023-38199: owasp coreruleset Type Confusion

CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2023-38199DEBIAN-CVE-2023-38199
Published 13-07-2023Last modified 30-10-2024
Open JSON

Vulnerability summary

CVE-2023-38199 is a critical (CVSS 9.8) Type Confusion vulnerability in owasp coreruleset. EPSS estimates a 0.75% chance of exploitation in the next 30 days, higher than 54% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.75%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DLA-4488-1

Timeline

  1. 13-07-2023
    PublishedVulnerability first disclosed.
  2. 30-10-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.75%

Chance of exploitation in the next 30 days

Percentile

54%

Versus all other CVEs

30-day change

0.00 pp

From 0.75% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.75%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • modsecurity-crs< 3.3.4-1+deb12u2 | < 3.3.5-1
Owasp1 product
Ubuntu1 product
  • modsecurity-crsAll versions (No fix recorded)

3 vendors · 3 products

References

5 links