{"id":"CVE-2024-23324","aliases":["BIT-envoy-2024-23324","EUVD-2024-20839","GHSA-gq3v-vvhj-96j6"],"status":"published","title":"Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata","description":"Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.006,"percentile":0.49245,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2024-02-09T22:48:26Z","modified":"2026-10-28T10:40:07Z","fixes":[{"ecosystem":"Bitnami","package":"envoy","fixed_in":["1.26.7","1.27.3","1.28.1","1.29.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"envoy","ranges":[{"type":"SEMVER","events":[{"introduced":"1.26.0"},{"fixed":"1.26.7"},{"introduced":"1.27.0"},{"fixed":"1.27.3"},{"introduced":"1.28.0"},{"fixed":"1.28.1"},{"introduced":"1.29.0"},{"fixed":"1.29.1"}]}]}],"products":[{"vendor":"envoyproxy","product":"envoy"}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-gq3v-vvhj-96j6","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory"]},{"url":"https://github.com/envoyproxy/envoy/commit/29989f6cc8bfd8cd2ffcb7c42711eb02c7a5168a","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-23324","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/23xxx/CVE-2024-23324.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2024-23324","title":"Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata","description":"Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.\n","status":"published","published":"2024-02-09T22:48:26.889Z","modified":"2024-08-19T16:12:49.967Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:34:05.444281Z"}],"euvd":[{"id":"EUVD-2024-20839","description":"Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.\n","status":"published","published":"2024-02-09T22:48:26Z","modified":"2024-08-19T16:12:49Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-03T00:56:15.627163Z"}],"nvd":[{"id":"CVE-2024-23324","description":"Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.\n","status":"published","published":"2024-02-09T23:15:09.223Z","modified":"2026-06-17T07:12:35.81Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:09:35.738752Z"}],"osv":[{"id":"CVE-2024-23324","title":"Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata","description":"Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.\n","status":"published","published":"2024-02-09T22:48:26.889Z","modified":"2026-10-28T10:40:07.601231248Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:44:38.577405Z"},{"id":"BIT-envoy-2024-23324","title":"Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata","description":"Envoy is a high-performance edge/middle/service proxy. External authentication can be bypassed by downstream connections. Downstream clients can force invalid gRPC requests to be sent to ext_authz, circumventing ext_authz checks when failure_mode_allow is set to true. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.","status":"published","published":"2024-03-06T10:51:54.396Z","modified":"2026-09-08T08:47:25.901361661Z","updated_at":"2026-11-02T15:28:29.563843Z"}]}}