CVE-2021-43568

CRITICAL 9.8CVE-2021-43568 · Published 09/11/2021 · updated 17/06/2026

In short

CVE-2021-43568 is a CRITICAL (CVSS 9.8) vulnerability affecting elixir ecdsa (starkbank).
Chance of exploitation in the next 30 days (EPSS): 1.1%, higher than 64.5% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
elixir ecdsa starkbank	`= 1.0.0`	No fix yet

Description

The verify function in the Stark Bank Elixir ECDSA library (ecdsa-elixir) 1.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.

References

starkbank/ecdsa-elixir release v1.0.1 · Third Party Advisory
research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries · Exploit

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