{"api_version":"1","generated_at":"2026-04-22T23:09:12+00:00","cve":"CVE-2023-27493","urls":{"html":"https://cve.report/CVE-2023-27493","api":"https://cve.report/api/cve/CVE-2023-27493.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-27493","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-27493"},"summary":{"title":"CVE-2023-27493","description":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, Envoy does not sanitize or escape request properties when generating request headers. This can lead to characters that are illegal in header values to be sent to the upstream service. In the worst case, it can cause upstream service to interpret the original request as two pipelined requests, possibly bypassing the intent of Envoy’s security policy. Versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9 contain a patch. As a workaround, disable adding request headers based on the downstream request properties, such as downstream certificate properties.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2023-04-04 20:15:00","updated_at":"2023-04-11 14:44:00"},"problem_types":["CWE-444"],"metrics":[],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-w5w5-487h-qv8q","name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-w5w5-487h-qv8q","refsource":"MISC","tags":[],"title":"Envoy doesn't escape HTTP header values · Advisory · envoyproxy/envoy · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-27493","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27493","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"27493","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"envoyproxy","cpe5":"envoy","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2023-27493","qid":"160710","title":"Oracle Enterprise Linux Security Update for olcne (ELSA-2023-23648)"},{"cve":"CVE-2023-27493","qid":"355149","title":"Amazon Linux Security Advisory for ecs-service-connect-agent : ALAS2023-2023-165"},{"cve":"CVE-2023-27493","qid":"355316","title":"Amazon Linux Security Advisory for ecs-service-connect-agent : ALAS2ECS-2023-003"}]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2023-27493","ASSIGNER":"security-advisories@github.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"Envoy is an open source edge and service proxy designed for cloud-native applications. 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As a workaround, disable adding request headers based on the downstream request properties, such as downstream certificate properties."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-20: Improper Input Validation","cweId":"CWE-20"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"envoyproxy","product":{"product_data":[{"product_name":"envoy","version":{"version_data":[{"version_affected":"=","version_value":">= 1.25.0, < 1.25.3"},{"version_affected":"=","version_value":">= 1.24.0, < 1.24.4"},{"version_affected":"=","version_value":">= 1.23.0, < 1.23.6"},{"version_affected":"=","version_value":"< 1.22.9"}]}}]}}]}},"references":{"reference_data":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-w5w5-487h-qv8q","refsource":"MISC","name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-w5w5-487h-qv8q"}]},"source":{"advisory":"GHSA-w5w5-487h-qv8q","discovery":"UNKNOWN"},"impact":{"cvss":[{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}]}},"nvd":{"publishedDate":"2023-04-04 20:15:00","lastModifiedDate":"2023-04-11 14:44:00","problem_types":["CWE-444"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL"},"exploitabilityScore":3.9,"impactScore":5.2}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.25.0","versionEndExcluding":"1.25.3","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.24.0","versionEndExcluding":"1.24.4","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.23.0","versionEndExcluding":"1.23.6","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionEndExcluding":"1.22.9","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}