CVE-2021-32781

{"containers": {"cna": {"affected": [{"product": "envoy", "vendor": "envoyproxy", "versions": [{"status": "affected", "version": ">= 1.19.0, < 1.19.1"}, {"status": "affected", "version": ">= 1.18.0, < 1.18.4"}, {"status": "affected", "version": ">= 1.17.0, < 1.17.4"}, {"status": "affected", "version": ">= 1.16.0, < 1.16.5"}]}], "descriptions": [{"lang": "en", "value": "Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-416", "description": "CWE-416: Use After Free", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-08-24T20:50:10.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history"}, {"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv"}], "source": {"advisory": "GHSA-5vhv-gp9v-42qv", "discovery": "UNKNOWN"}, "title": "Continued processing of requests after locally generated response", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-32781", "STATE": "PUBLIC", "TITLE": "Continued processing of requests after locally generated response"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "envoy", "version": {"version_data": [{"version_value": ">= 1.19.0, < 1.19.1"}, {"version_value": ">= 1.18.0, < 1.18.4"}, {"version_value": ">= 1.17.0, < 1.17.4"}, {"version_value": ">= 1.16.0, < 1.16.5"}]}}]}, "vendor_name": "envoyproxy"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-416: Use After Free"}]}]}, "references": {"reference_data": [{"name": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history", "refsource": "MISC", "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history"}, {"name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv", "refsource": "CONFIRM", "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv"}]}, "source": {"advisory": "GHSA-5vhv-gp9v-42qv", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T23:33:55.673Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history"}, {"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-32781", "datePublished": "2021-08-24T20:50:10.000Z", "dateReserved": "2021-05-12T00:00:00.000Z", "dateUpdated": "2024-08-03T23:33:55.673Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{}

{"affected": [{"affectedData": [{"product": "envoy", "vendor": "envoyproxy", "versions": [{"status": "affected", "version": ">= 1.19.0, < 1.19.1"}, {"status": "affected", "version": ">= 1.18.0, < 1.18.4"}, {"status": "affected", "version": ">= 1.17.0, < 1.17.4"}, {"status": "affected", "version": ">= 1.16.0, < 1.16.5"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "AFC3BF7F-5B28-4765-8C6F-E2437A4B425D", "versionEndExcluding": "1.16.5", "versionStartIncluding": "1.16.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "83547329-1394-417F-93DB-70C1A9D173B0", "versionEndExcluding": "1.17.4", "versionStartIncluding": "1.17.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "D7376E28-9915-4CA1-A5DB-40874D10E781", "versionEndExcluding": "1.18.4", "versionStartIncluding": "1.18.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:1.19.0:*:*:*:*:*:*:*", "matchCriteriaId": "1968AA35-60E2-4A00-84A0-617738B55D33", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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 after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible."}, {"lang": "es", "value": "Envoy es un proxy L7 de c\u00f3digo abierto y un bus de comunicaci\u00f3n dise\u00f1ado para grandes arquitecturas modernas orientadas a servicios. En las versiones afectadas, despu\u00e9s de que Envoy env\u00ede una respuesta generada localmente, debe detener el procesamiento posterior de los datos de la petici\u00f3n o la respuesta. Sin embargo, cuando la respuesta local es generada debido al desbordamiento del b\u00fafer interno mientras la petici\u00f3n o la respuesta es procesada por la cadena de filtrado, la operaci\u00f3n puede no detenerse completamente y resultar en el acceso a un bloque de memoria liberado. Una petici\u00f3n construida espec\u00edficamente y entregada por un peer descendente o ascendente que no es confiable en presencia de extensiones que modifican y aumentan el tama\u00f1o de los cuerpos de la petici\u00f3n o la respuesta, resultando en una Denegaci\u00f3n de Servicio cuando son usadas extensiones que modifican y aumentan el tama\u00f1o de los cuerpos de la petici\u00f3n o la respuesta, como el filtro descompresor. Envoy versiones 1.19.1, 1.18.4, 1.17.4 y 1.16.5, contienen correcciones para solucionar la terminaci\u00f3n incompleta del procesamiento de peticiones tras la respuesta generada localmente. Como soluci\u00f3n, deshabilite las extensiones decompressor, json-transcoder o grpc-web de Envoy o las extensiones propietarias que modifican y aumentan el tama\u00f1o de los cuerpos de las peticiones o respuestas, si es posible."}], "id": "CVE-2021-32781", "lastModified": "2026-06-17T03:53:37.113", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.6, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.0, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-24T21:15:10.157", "references": [{"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-5vhv-gp9v-42qv"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-120"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Envoy Security Team for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:3273", "cpe": "cpe:/a:redhat:service_mesh:1.1::el8", "package": "servicemesh-proxy-0:1.1.17-2.el8", "product_name": "OpenShift Service Mesh 1.1", "release_date": "2021-08-25T00:00:00Z"}, {"advisory": "RHSA-2021:3272", "cpe": "cpe:/a:redhat:service_mesh:2.0::el8", "package": "servicemesh-proxy-0:2.0.7-3.el8", "product_name": "OpenShift Service Mesh 2.0", "release_date": "2021-08-25T00:00:00Z"}], "bugzilla": {"description": "envoyproxy/envoy: denial of service when using extensions that modify request or response sizes", "id": "1996935", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1996935"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-476", "details": ["Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions after Envoy sends a locally generated response it must stop further processing of request or response data. However when local response is generated due the internal buffer overflow while request or response is processed by the filter chain the operation may not be stopped completely and result in accessing a freed memory block. A specifically constructed request delivered by an untrusted downstream or upstream peer in the presence of extensions that modify and increase the size of request or response bodies resulting in a Denial of Service when using extensions that modify and increase the size of request or response bodies, such as decompressor filter. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to address incomplete termination of request processing after locally generated response. As a workaround disable Envoy's decompressor, json-transcoder or grpc-web extensions or proprietary extensions that modify and increase the size of request or response bodies, if feasible.", "An out-of-bounds memory read vulnerability was found in envoyproxy/envoy. When using one of the following envoy extensions, it is possible to modify and increase the request or response body size of the following: the decompressor, json-transcoder, grpc-web, or other proprietary extensions. This flaw allows an attacker to read invalid memory and cause envoy to crash, resulting in a denial of service. The highest threat from this vulnerability is to system availability."], "name": "CVE-2021-32781", "public_date": "2021-08-24T19:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-32781\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-32781\nhttps://istio.io/latest/news/security/istio-security-2021-008/"], "threat_severity": "Important"}

{}