{"containers": {"cna": {"affected": [{"product": "envoy", "vendor": "envoyproxy", "versions": [{"status": "affected", "version": "< 1.18.6"}, {"status": "affected", "version": ">= 1.19.0, < 1.19.3"}, {"status": "affected", "version": ">= 1.20.0, < 1.20.2"}, {"status": "affected", "version": ">= 1.21.0, < 1.21.1"}]}], "descriptions": [{"lang": "en", "value": "Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade."}], "metrics": [{"cvssV3_1": {"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"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-416", "description": "CWE-416: Use After Free", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2022-02-22T22:45:22.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145"}], "source": {"advisory": "GHSA-cmx3-fvgf-83mf", "discovery": "UNKNOWN"}, "title": "Crash when tunneling TCP over HTTP in Envoy", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-43826", "STATE": "PUBLIC", "TITLE": "Crash when tunneling TCP over HTTP in Envoy"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "envoy", "version": {"version_data": [{"version_value": "< 1.18.6"}, {"version_value": ">= 1.19.0, < 1.19.3"}, {"version_value": ">= 1.20.0, < 1.20.2"}, {"version_value": ">= 1.21.0, < 1.21.1"}]}}]}, "vendor_name": "envoyproxy"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade."}]}, "impact": {"cvss": {"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"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-416: Use After Free"}]}]}, "references": {"reference_data": [{"name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf", "refsource": "CONFIRM", "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf"}, {"name": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145", "refsource": "MISC", "url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145"}]}, "source": {"advisory": "GHSA-cmx3-fvgf-83mf", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T04:03:09.047Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-04-23T15:57:19.863004Z", "id": "CVE-2021-43826", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-23T19:01:09.708Z"}}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-43826", "datePublished": "2022-02-22T22:45:22.000Z", "dateReserved": "2021-11-16T00:00:00.000Z", "dateUpdated": "2025-04-23T19:01:09.708Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf", "tags": ["x_refsource_CONFIRM", "x_transferred"]}, {"url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145", "tags": ["x_refsource_MISC", "x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T04:03:09.047Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-43826", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-04-23T15:57:19.863004Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-04-23T15:57:21.559Z"}}], "cna": {"title": "Crash when tunneling TCP over HTTP in Envoy", "source": {"advisory": "GHSA-cmx3-fvgf-83mf", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "envoyproxy", "product": "envoy", "versions": [{"status": "affected", "version": "< 1.18.6"}, {"status": "affected", "version": ">= 1.19.0, < 1.19.3"}, {"status": "affected", "version": ">= 1.20.0, < 1.20.2"}, {"status": "affected", "version": ">= 1.21.0, < 1.21.1"}]}], "references": [{"url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416: Use After Free"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2022-02-22T22:45:22.000Z"}, "x_legacyV4Record": {"impact": {"cvss": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, "source": {"advisory": "GHSA-cmx3-fvgf-83mf", "discovery": "UNKNOWN"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"version": {"version_data": [{"version_value": "< 1.18.6"}, {"version_value": ">= 1.19.0, < 1.19.3"}, {"version_value": ">= 1.20.0, < 1.20.2"}, {"version_value": ">= 1.21.0, < 1.21.1"}]}, "product_name": "envoy"}]}, "vendor_name": "envoyproxy"}]}}, "data_type": "CVE", "references": {"reference_data": [{"url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf", "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf", "refsource": "CONFIRM"}, {"url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145", "name": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145", "refsource": "MISC"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "eng", "value": "Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-416: Use After Free"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2021-43826", "STATE": "PUBLIC", "TITLE": "Crash when tunneling TCP over HTTP in Envoy", "ASSIGNER": "security-advisories@github.com"}}}}, "cveMetadata": {"cveId": "CVE-2021-43826", "state": "PUBLISHED", "dateUpdated": "2025-04-23T19:01:09.708Z", "dateReserved": "2021-11-16T00:00:00.000Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2022-02-22T22:45:22.000Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "0EFC93D0-C206-417C-81D0-F18145E3D768", "versionEndExcluding": "1.18.6", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "2812AC62-44B5-4077-862D-A221CD88981D", "versionEndExcluding": "1.19.3", "versionStartIncluding": "1.19.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "F5441B2D-F807-4ED9-AFB9-ED4DE07CE5F8", "versionEndExcluding": "1.20.2", "versionStartIncluding": "1.20.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*", "matchCriteriaId": "83895D03-DAD1-4893-8A1C-F9143DEEC172", "versionEndExcluding": "1.21.1", "versionStartIncluding": "1.21.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade."}, {"lang": "es", "value": "Envoy es un proxy de borde y servicio de c\u00f3digo abierto, dise\u00f1ado para aplicaciones nativas de la nube. En las versiones afectadas de Envoy se produce un bloqueo cuando es configurada para :ref:\"upstream tunneling (envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config)\" y la conexi\u00f3n de bajada es desconectada mientras sigue estableciendo la conexi\u00f3n de subida o el flujo http/2. No se presentan medidas de mitigaci\u00f3n para este problema. Es recomendado a usuarios actualizar"}], "id": "CVE-2021-43826", "lastModified": "2024-11-21T06:29:52.647", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 4.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "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": 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": "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": "2022-02-22T23:15:10.957", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/commit/ce0ae309057a216aba031aff81c445c90c6ef145"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2022:1276", "cpe": "cpe:/a:redhat:service_mesh:2.0::el8", "package": "servicemesh-proxy-0:2.0.9-3.el8", "product_name": "OpenShift Service Mesh 2.0", "release_date": "2022-04-07T00:00:00Z"}, {"advisory": "RHSA-2022:1275", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-proxy-0:2.1.2-4.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2022-04-07T00:00:00Z"}], "bugzilla": {"description": "envoy: Use-after-free when tunneling TCP over HTTP", "id": "2050748", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2050748"}, "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-416", "details": ["Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions of Envoy a crash occurs when configured for :ref:`upstream tunneling <envoy_v3_api_field_extensions.filters.network.tcp_proxy.v3.TcpProxy.tunneling_config>` and the downstream connection disconnects while the the upstream connection or http/2 stream is still being established. There are no workarounds for this issue. Users are advised to upgrade.", "A flaw was found in envoy. If a downstream source disconnects during upstream connection establishment when tunneling TCP over HTTP, a use-after-free can occur, resulting in a denial of service."], "name": "CVE-2021-43826", "public_date": "2022-02-22T07:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-43826\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-43826\nhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-cmx3-fvgf-83mf"], "threat_severity": "Moderate"}