CVE-2021-43570: Starkbank Ecdsa-Java

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

Published 2021-11-09. Last modified 2026-06-17.