{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-17T11:12:32.475","vulnerabilities":[{"cve":{"id":"CVE-2021-32777","sourceIdentifier":"security-advisories@github.com","published":"2021-08-24T21:15:06.970","lastModified":"2024-11-21T06:07:43.210","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions when ext-authz extension is sending request headers to the external authorization service it must merge multiple value headers according to the HTTP spec. However, only the last header value is sent. This may allow specifically crafted requests to bypass authorization. Attackers may be able to escalate privileges when using ext-authz extension or back end service that uses multiple value headers for authorization. A specifically constructed request may be delivered by an untrusted downstream peer in the presence of ext-authz extension. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to the ext-authz extension to correctly merge multiple request header values, when sending request for authorization."},{"lang":"es","value":"Envoy es un proxy L7 de código abierto y un bus de comunicación diseñado para grandes arquitecturas modernas orientadas a servicios. En las versiones afectadas, cuando la extensión ext-authz envía los encabezados de las peticiones al servicio de autorización externo, debe combinar varios encabezados de valores de acuerdo con las especificaciones HTTP. Sin embargo, sólo se envía el último valor del encabezado. Esto puede permitir a peticiones específicamente diseñadas omitir la autorización. Unos atacantes pueden ser capaces de escalar privilegios cuando es usada la extensión ext-authz o el servicio de back-end que usa múltiples valores del encabezado para la autorización. Una petición específicamente construida puede ser entregada por un peer downstream no confiable en presencia de la extensión ext-authz. Envoy versiones 1.19.1, 1.18.4, 1.17.4, 1.16.5, contienen correcciones a la extensión ext-authz para combinar correctamente los valores de los encabezados de peticiones múltiples, cuando se envían peticiones de autorización."}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","baseScore":8.6,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":4.0},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L","baseScore":8.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":3.7}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:P/I:P/A:P","baseScore":7.5,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"PARTIAL"},"baseSeverity":"HIGH","exploitabilityScore":10.0,"impactScore":6.4,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-551"},{"lang":"en","value":"CWE-863"}]},{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-863"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.16.0","versionEndExcluding":"1.16.5","matchCriteriaId":"AFC3BF7F-5B28-4765-8C6F-E2437A4B425D"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.17.0","versionEndExcluding":"1.17.4","matchCriteriaId":"83547329-1394-417F-93DB-70C1A9D173B0"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*","versionStartIncluding":"1.18.0","versionEndExcluding":"1.18.4","matchCriteriaId":"D7376E28-9915-4CA1-A5DB-40874D10E781"},{"vulnerable":true,"criteria":"cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*","matchCriteriaId":"1968AA35-60E2-4A00-84A0-617738B55D33"}]}]}],"references":[{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history","source":"security-advisories@github.com","tags":["Release Notes","Vendor Advisory"]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-6g4j-5vrw-2m8h","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]},{"url":"https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Vendor Advisory"]}]}}]}