{"api_version":"1","generated_at":"2026-04-22T21:27:33+00:00","cve":"CVE-2023-35943","urls":{"html":"https://cve.report/CVE-2023-35943","api":"https://cve.report/api/cve/CVE-2023-35943.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-35943","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-35943"},"summary":{"title":"CVE-2023-35943","description":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, the CORS filter will segfault and crash Envoy when the `origin` header is removed and deleted between `decodeHeaders`and `encodeHeaders`. Versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12 have a fix for this issue. 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As a workaround, do not remove the `origin` header in the Envoy configuration."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-416: Use After Free","cweId":"CWE-416"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"envoyproxy","product":{"product_data":[{"product_name":"envoy","version":{"version_data":[{"version_affected":"=","version_value":">= 1.26.0, < 1.26.4"},{"version_affected":"=","version_value":">= 1.25.0, < 1.25.9"},{"version_affected":"=","version_value":">= 1.24.0, < 1.24.10"},{"version_affected":"=","version_value":"< 1.23.12"}]}}]}}]}},"references":{"reference_data":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-mc6h-6j9x-v3gq","refsource":"MISC","name":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-mc6h-6j9x-v3gq"}]},"source":{"advisory":"GHSA-mc6h-6j9x-v3gq","discovery":"UNKNOWN"},"impact":{"cvss":[{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H","version":"3.1"}]}},"nvd":{"publishedDate":"2023-07-25 19:15:00","lastModifiedDate":"2023-08-02 18:47:00","problem_types":["CWE-416"],"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}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.24.0","versionEndExcluding":"1.24.10","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.25.0","versionEndExcluding":"1.25.9","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.26.0","versionEndExcluding":"1.26.4","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.23.0","versionEndExcluding":"1.23.12","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}