{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2021-34549","sourceIdentifier":"cve@mitre.org","published":"2021-06-29T12:15:08.643","lastModified":"2026-06-17T03:56:06.317","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"An issue was discovered in Tor before 0.4.6.5, aka TROVE-2021-005. Hashing is mishandled for certain retrieval of circuit data. Consequently. an attacker can trigger the use of an attacker-chosen circuit ID to cause algorithm inefficiency."},{"lang":"es","value":"Se ha detectado un problema en Tor versiones anteriores a 0.4.6.5, también se conoce como TROVE-2021-005. Un hashing es manejado inapropiadamente para determinadas recuperaciones de datos del circuito. Consecuentemente, un atacante puede desencadenar un ID de circuito elegido por el atacante para causar ineficiencia en el algoritmo"}],"affected":[{"source":"cve@mitre.org","affectedData":[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","baseScore":5.0,"accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL"},"baseSeverity":"MEDIUM","exploitabilityScore":10.0,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-400"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*","versionEndExcluding":"0.3.5.15","matchCriteriaId":"C2666B22-DC07-4BFA-A756-3DC4E970EBDD"},{"vulnerable":true,"criteria":"cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*","versionStartIncluding":"0.4.0.0","versionEndExcluding":"0.4.4.9","matchCriteriaId":"072B35B0-7EBF-4652-BB89-12B4BEC9A8EF"},{"vulnerable":true,"criteria":"cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*","versionStartIncluding":"0.4.5.0","versionEndExcluding":"0.4.5.9","matchCriteriaId":"57ED9234-622B-4B0D-8E29-2851A87DE0D1"},{"vulnerable":true,"criteria":"cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*","versionStartIncluding":"0.4.6.0","versionEndExcluding":"0.4.6.5","matchCriteriaId":"EFD89230-DBEF-4134-9C42-8187CE542B7C"}]}]}],"references":[{"url":"https://blog.torproject.org/node/2041","source":"cve@mitre.org","tags":["Release Notes","Vendor Advisory"]},{"url":"https://gitlab.torproject.org/tpo/core/tor/-/issues/40391","source":"cve@mitre.org","tags":["Broken Link"]},{"url":"https://security.gentoo.org/glsa/202107-25","source":"cve@mitre.org","tags":["Third Party Advisory"]},{"url":"https://blog.torproject.org/node/2041","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Vendor Advisory"]},{"url":"https://gitlab.torproject.org/tpo/core/tor/-/issues/40391","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Broken Link"]},{"url":"https://security.gentoo.org/glsa/202107-25","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]}]}}