CVE-2021-31921

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*", "matchCriteriaId": "CD72BDF7-907A-407F-94BF-ACDB1F8FFAD1", "versionEndExcluding": "1.8.6", "vulnerable": true}, {"criteria": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*", "matchCriteriaId": "EF73EA19-5803-4F37-A250-1C8597A17FA1", "versionEndExcluding": "1.9.5", "versionStartIncluding": "1.9.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration."}, {"lang": "es", "value": "Istio antes de la versi\u00f3n 1.8.6 y 1.9.x antes de la versi\u00f3n 1.9.5 contiene una vulnerabilidad explotable de forma remota por la que un cliente externo puede acceder a servicios inesperados en el cl\u00faster, salt\u00e1ndose las comprobaciones de autorizaci\u00f3n, cuando una puerta de enlace est\u00e1 configurada con la configuraci\u00f3n de enrutamiento AUTO_PASSTHROUGH"}], "id": "CVE-2021-31921", "lastModified": "2026-06-17T03:52:29.790", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-06-02T16:15:08.927", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Vendor Advisory"], "url": "https://istio.io/latest/news/security/istio-security-2021-006/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Vendor Advisory"], "url": "https://istio.io/latest/news/security/istio-security-2021-006/"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-862"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank the Istio Product Security Working Group for reporting this issue.", "affected_release": [{"advisory": "RHSA-2021:2085", "cpe": "cpe:/a:redhat:service_mesh:1.1::el8", "package": "servicemesh-0:1.1.15-4.el8", "product_name": "OpenShift Service Mesh 1.1", "release_date": "2021-05-20T00:00:00Z"}, {"advisory": "RHSA-2021:2061", "cpe": "cpe:/a:redhat:service_mesh:2.0::el8", "package": "servicemesh-0:2.0.5-3.el8", "product_name": "OpenShift Service Mesh 2.0", "release_date": "2021-05-20T00:00:00Z"}], "bugzilla": {"description": "istio/istio: authorization bypass when using AUTO_PASSTHROUGH", "id": "1955396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1955396"}, "csaw": false, "cvss3": {"cvss3_base_score": "10.0", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-863", "details": ["Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.", "An authorization bypass vulnerability was found in istio. When the istio gateway is configured with TLS mode `AUTO_PASSTHROUGH`, it is possible for a malicious user to bypass the authorization checks and gain access to protected services. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability."], "name": "CVE-2021-31921", "public_date": "2021-05-11T19:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-31921\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-31921\nhttps://istio.io/latest/news/security/istio-security-2021-006/"], "statement": "To determine if a potential istio gateway might be affected by this vulnerability, the same command specified here: https://istio.io/latest/news/security/istio-security-2021-006/ can also be applied to OpenShift ServiceMesh using the `oc` cli instead of `kubectl`:\n$ oc get gateways.networking.istio.io -A -o \"custom-columns=NAMESPACE:.metadata.namespace,NAME:.metadata.name,TLS_MODE:.spec.servers[*].tls.mode\"\nNAMESPACE \u00a0 NAME \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 TLS_MODE\ntest \u00a0 \u00a0test-gateway \u00a0 <none>\nAs specified in the linked reference, if the `TLS_MODE` returned is `AUTO_PASSTHROUGH` then the gateway may be affected.", "threat_severity": "Important"}

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