{"id":"CVE-2021-43570","details":"The verify function in the Stark Bank Java ECDSA library (ecdsa-java) 1.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.","aliases":["GHSA-r28h-x6hv-2fq3"],"modified":"2026-07-09T05:45:32.969639Z","published":"2021-11-09T22:15:07.640Z","references":[{"type":"ADVISORY","url":"https://github.com/starkbank/ecdsa-java/releases/tag/v1.0.1"},{"type":"EVIDENCE","url":"https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/starkbank/ecdsa-java","events":[{"introduced":"4d191d775f7b46b7608b9902d13683e5d12e3d45"},{"last_affected":"4d191d775f7b46b7608b9902d13683e5d12e3d45"},{"fixed":"b08ba784149e668f42a21444cd0527fb0d9b13da"}],"database_specific":{"cpe":"cpe:2.3:a:starkbank:ecdsa-java:1.0.0:*:*:*:*:*:*:*","extracted_events":[{"introduced":"1.0.0"},{"last_affected":"1.0.0"}],"source":["CPE_STRING","REFERENCES"]}}],"versions":["1.0.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43570.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}