CVE-2021-32778

{"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 envoy\u2019s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-834", "description": "CWE-834: Excessive Iteration", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-08-24T20:30:11.000Z", "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-3xh3-33v5-chcc"}], "source": {"advisory": "GHSA-3xh3-33v5-chcc", "discovery": "UNKNOWN"}, "title": "Excessive CPU utilization when closing HTTP/2 streams", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-32778", "STATE": "PUBLIC", "TITLE": "Excessive CPU utilization when closing HTTP/2 streams"}, "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 envoy\u2019s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-834: Excessive Iteration"}]}]}, "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-3xh3-33v5-chcc", "refsource": "CONFIRM", "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc"}]}, "source": {"advisory": "GHSA-3xh3-33v5-chcc", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T23:33:55.854Z"}, "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-3xh3-33v5-chcc"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-32778", "datePublished": "2021-08-24T20:30:11.000Z", "dateReserved": "2021-05-12T00:00:00.000Z", "dateUpdated": "2024-08-03T23:33:55.854Z", "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 envoy\u2019s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100."}, {"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, el procedimiento de Envoy para restablecer un flujo HTTP/2 presenta una complejidad O(N^2), conllevando a un alto uso de la CPU cuando se restablece un gran n\u00famero de flujos. Los despliegues son susceptibles a una Denegaci\u00f3n de Servicio cuando Envoy est\u00e1 configurado con un alto l\u00edmite de flujos concurrentes H/2. Un atacante que desee explotar esta vulnerabilidad necesitar\u00eda un cliente que abriera y cerrara un gran n\u00famero de flujos H/2. Envoy versiones 1.19.1, 1.18.4, 1.17.4 y 1.16.5, contienen correcciones para reducir la complejidad del tiempo de restablecimiento de los flujos HTTP/2. Como soluci\u00f3n, los usuarios pueden limitar el n\u00famero de sue\u00f1os HTTP/2 simult\u00e1neos para los pares ascendentes y descendentes a un n\u00famero bajo, es decir, 100."}], "id": "CVE-2021-32778", "lastModified": "2026-06-17T03:53:36.730", "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": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "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": "2021-08-24T21:15:09.553", "references": [{"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xh3-33v5-chcc"}, {"source": "security-advisories@github.com", "tags": ["Release Notes", "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-3xh3-33v5-chcc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes", "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-834"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-834"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Envoy Security Team for reporting this issue.", "affected_release": [{"advisory": "RHEA-2021:4051", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-0:2.1.0-5.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHEA-2021:4051", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-grafana-0:7.2.1-2.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHEA-2021:4051", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-operator-0:2.1.0-4.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHEA-2021:4051", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-prometheus-0:2.23.0-1.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHEA-2021:4051", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-proxy-0:2.1.0-13.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2021-11-02T00:00:00Z"}, {"advisory": "RHEA-2021:4051", "cpe": "cpe:/a:redhat:service_mesh:2.1::el8", "package": "servicemesh-ratelimit-0:2.1.0-1.el8", "product_name": "OpenShift Service Mesh 2.1", "release_date": "2021-11-02T00:00:00Z"}], "bugzilla": {"description": "envoyproxy/envoy: excessive CPU usage when handling a large number of HTTP/2 requests", "id": "1996946", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1996946"}, "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-400", "details": ["Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions envoy\u2019s procedure for resetting a HTTP/2 stream has O(N^2) complexity, leading to high CPU utilization when a large number of streams are reset. Deployments are susceptible to Denial of Service when Envoy is configured with high limit on H/2 concurrent streams. An attacker wishing to exploit this vulnerability would require a client opening and closing a large number of H/2 streams. Envoy versions 1.19.1, 1.18.4, 1.17.4, 1.16.5 contain fixes to reduce time complexity of resetting HTTP/2 streams. As a workaround users may limit the number of simultaneous HTTP/2 dreams for upstream and downstream peers to a low number, i.e. 100.", "An uncontrolled resource consumption vulnerability was found in envoyproxy/envoy. When envoy handles a large number of HTTP/2 requests which open and then reset the connection, it can cause excessive CPU usage. This flaw allows an attacker to cause a denial of service on the proxy. The highest threat from this vulnerability is to system availability."], "name": "CVE-2021-32778", "package_state": [{"cpe": "cpe:/a:redhat:service_mesh:1", "fix_state": "Affected", "package_name": "servicemesh-proxy", "product_name": "OpenShift Service Mesh 1"}, {"cpe": "cpe:/a:redhat:service_mesh:2.0", "fix_state": "Affected", "package_name": "servicemesh-proxy", "product_name": "OpenShift Service Mesh 2.0"}], "public_date": "2021-08-24T19:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-32778\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-32778\nhttps://istio.io/latest/news/security/istio-security-2021-008/"], "threat_severity": "Important"}

{}