{"api_version":"1","generated_at":"2026-04-21T08:56:16+00:00","cve":"CVE-2019-14243","urls":{"html":"https://cve.report/CVE-2019-14243","api":"https://cve.report/api/cve/CVE-2019-14243.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2019-14243","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-14243"},"summary":{"title":"CVE-2019-14243","description":"headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon crash) via a crafted HAProxy PROXY v2 request with truncated source/destination address data.","state":"PUBLIC","assigner":"cve@mitre.org","published_at":"2019-07-23 22:15:00","updated_at":"2019-12-16 17:45:00"},"problem_types":["CWE-20"],"metrics":[],"references":[{"url":"https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90ac","name":"https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90ac","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Add test and fix for malformed/truncated header · mastercactapus/proxyprotocol@5c4a101 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014","name":"https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014","refsource":"MISC","tags":["Third Party Advisory"],"title":"DoS in http.proxyprotocol plugin - Plugins - Caddy Community","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101","name":"https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101","refsource":"MISC","tags":["Third Party Advisory"],"title":"Comparing ef496d7...5c4a101 · mastercactapus/proxyprotocol · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastercactapus/caddy-proxyprotocol/issues/8","name":"https://github.com/mastercactapus/caddy-proxyprotocol/issues/8","refsource":"MISC","tags":["Issue Tracking","Third Party Advisory"],"title":"Denial of service vulnerability with invalid v2 PROXY data · Issue #8 · mastercactapus/caddy-proxyprotocol · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2","name":"https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2","refsource":"MISC","tags":["Release Notes","Third Party Advisory"],"title":"Release v0.0.2 · mastercactapus/proxyprotocol · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/mastercactapus/proxyprotocol/issues/1","name":"https://github.com/mastercactapus/proxyprotocol/issues/1","refsource":"MISC","tags":["Exploit","Third Party Advisory"],"title":"Invalid V2 PROXY data causes parsing panics/denial-of-service · Issue #1 · mastercactapus/proxyprotocol · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-14243","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-14243","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2019","cve_id":"14243","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"haproxy","cpe5":"proxyprotocol","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"caddy","cpe12":"*","cpe13":"*"},{"cve_year":"2019","cve_id":"14243","vulnerable":"1","versionEndIncluding":"1","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"haproxy","cpe5":"proxyprotocol","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"caddy","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"cve@mitre.org","ID":"CVE-2019-14243","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"n/a","version":{"version_data":[{"version_value":"n/a"}]}}]},"vendor_name":"n/a"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon crash) via a crafted HAProxy PROXY v2 request with truncated source/destination address data."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"n/a"}]}]},"references":{"reference_data":[{"url":"https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014","refsource":"MISC","name":"https://caddy.community/t/dos-in-http-proxyprotocol-plugin/6014"},{"url":"https://github.com/mastercactapus/proxyprotocol/issues/1","refsource":"MISC","name":"https://github.com/mastercactapus/proxyprotocol/issues/1"},{"url":"https://github.com/mastercactapus/caddy-proxyprotocol/issues/8","refsource":"MISC","name":"https://github.com/mastercactapus/caddy-proxyprotocol/issues/8"},{"url":"https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101","refsource":"MISC","name":"https://github.com/mastercactapus/proxyprotocol/compare/ef496d7...5c4a101"},{"url":"https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90ac","refsource":"MISC","name":"https://github.com/mastercactapus/proxyprotocol/commit/5c4a101121fc3e868026189c7a73f7f19eef90ac"},{"url":"https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2","refsource":"MISC","name":"https://github.com/mastercactapus/proxyprotocol/releases/tag/v0.0.2"}]}},"nvd":{"publishedDate":"2019-07-23 22:15:00","lastModifiedDate":"2019-12-16 17:45:00","problem_types":["CWE-20"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:haproxy:proxyprotocol:*:*:*:*:*:caddy:*:*","versionEndExcluding":"0.0.2","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2019","CveId":"14243","Ordinal":"153100","Title":"CVE-2019-14243","CVE":"CVE-2019-14243","Year":"2019"},"notes":[{"CveYear":"2019","CveId":"14243","Ordinal":"1","NoteData":"headerv2.go in mastercactapus proxyprotocol before 0.0.2, as used in the mastercactapus caddy-proxyprotocol plugin through 0.0.2 for Caddy, allows remote attackers to cause a denial of service (webserver panic and daemon crash) via a crafted HAProxy PROXY v2 request with truncated source/destination address data.","Type":"Description","Title":null},{"CveYear":"2019","CveId":"14243","Ordinal":"2","NoteData":"2019-07-23","Type":"Other","Title":"Published"},{"CveYear":"2019","CveId":"14243","Ordinal":"3","NoteData":"2019-07-23","Type":"Other","Title":"Modified"}]}}}