{"schemaVersion":3,"id":"CVE-2023-38199","aliases":["UBUNTU-CVE-2023-38199","DEBIAN-CVE-2023-38199"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2023-07-13T00:00:00.000Z","modified":"2024-10-30T18:55:24.723Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00748,"percentile":0.54063,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00748},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00748,"percentile":0.54063}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00748,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00748,"percentile":0.54063}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-843","name":"Access of Resource Using Incompatible Type ('Type Confusion')","description":"The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/843.html"}],"affected":[{"vendor":"debian","product":"modsecurity-crs","name":"modsecurity-crs","label":"modsecurity-crs","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/modsecurity-crs","purlType":"deb","versions":[{"text":"< 3.3.4-1+deb12u2","noFixRecorded":false,"fixedIn":null},{"text":"< 3.3.5-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 3.3.4-1+deb12u2 | < 3.3.5-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"modsecurity-crs","name":"modsecurity-crs","label":"modsecurity-crs","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/modsecurity-crs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"owasp","product":"coreruleset","name":"coreruleset","label":"coreruleset","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 3.3.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 3.3.4","eol":null,"hubHref":"/vendor/owasp/coreruleset"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/coreruleset/coreruleset/issues/3191","label":"github.com/coreruleset/coreruleset/issues/3191","hostname":"github.com","tags":["REPORT","Issue Tracking","Patch"]},{"url":"https://github.com/coreruleset/coreruleset/pull/3237","label":"github.com/coreruleset/coreruleset/pull/3237","hostname":"github.com","tags":["REPORT","Issue Tracking"]},{"url":"https://ubuntu.com/security/CVE-2023-38199","label":"ubuntu.com/security/CVE-2023-38199","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-38199","label":"www.cve.org/CVERecord?id=CVE-2023-38199","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-38199","label":"security-tracker.debian.org/tracker/CVE-2023-38199","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-4488-1"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2023-07-13T00:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-10-30T18:55:24.723Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T19:11:24.476Z","stale":false,"partial":false}}