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{"affected": [{"affectedData": [{"product": "Eclipse Californium", "vendor": "The Eclipse Foundation", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "2.0.0", "versionType": "custom"}, {"lessThanOrEqual": "2.6.4", "status": "affected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "unspecified", "status": "affected", "version": "3.0.0-M1", "versionType": "custom"}, {"lessThanOrEqual": "3.0.0-M3", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "emo@eclipse.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:eclipse:californium:*:*:*:*:*:*:*:*", "matchCriteriaId": "65A08A46-AE52-493B-BD3B-06B7F33A6199", "versionEndExcluding": "2.6.5", "versionStartIncluding": "2.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:eclipse:californium:3.0.0:m1:*:*:*:*:*:*", "matchCriteriaId": "9664425C-0BC8-42FA-A128-4888792AABD6", "vulnerable": true}, {"criteria": "cpe:2.3:a:eclipse:californium:3.0.0:m2:*:*:*:*:*:*", "matchCriteriaId": "5BAEC5E6-CADE-402A-8741-C6962C051A16", "vulnerable": true}, {"criteria": "cpe:2.3:a:eclipse:californium:3.0.0:m3:*:*:*:*:*:*", "matchCriteriaId": "72226029-FA1A-41D5-BF95-A60C830C394A", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In Eclipse Californium version 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3, the certificate based (x509 and RPK) DTLS handshakes accidentally succeeds without verifying the server side's signature on the client side, if that signature is not included in the server's ServerKeyExchange."}, {"lang": "es", "value": "En Eclipse Californium versiones 2.0.0 a 2.6.4 y 3.0.0-M1 a 3.0.0-M3, los handshakes DTLS basados en certificados (x509 y RPK) presentan \u00e9xito accidentalmente sin verificar la firma del lado del servidor en el lado del cliente, si esa firma no est\u00e1 incluida en el ServerKeyExchange del servidor."}], "id": "CVE-2021-34433", "lastModified": "2026-06-17T03:55:51.527", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "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": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-20T17:15:07.687", "references": [{"source": "emo@eclipse.org", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=575281"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugs.eclipse.org/bugs/show_bug.cgi?id=575281"}], "sourceIdentifier": "emo@eclipse.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-322"}], "source": "emo@eclipse.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-347"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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