{"id":"CVE-2019-18838","url":"https://www.cyber-defence.io/tools/cve/CVE-2019-18838","generatedAt":"2026-10-28T04:17:18.676Z","title":"An issue was discovered in Envoy 1.12.0.","description":"An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated \"Invalid request\" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.","published":"2019-12-13T13:15:11.000Z","lastModified":"2026-06-17T02:25:27.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["envoyproxy/envoy"],"epss":{"score":0.02142,"percentile":0.81967,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://blog.envoyproxy.io","tags":["Product"],"source":"cve@mitre.org"},{"url":"https://github.com/envoyproxy/envoy/commits/master","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://groups.google.com/forum/#%21forum/envoy-users","source":"cve@mitre.org"},{"url":"https://blog.envoyproxy.io","tags":["Product"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/envoyproxy/envoy/commits/master","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://groups.google.com/forum/#%21forum/envoy-users","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-18838","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}