What’s Vulnerable › Vulnerabilities

CVE-2021-43568

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-11-09 · updated 2026-06-17
• Weakness: CWE-347

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.

Affected products

• Starkbank Elixir Ecdsa: 1.0.0

References

• https://github.com/starkbank/ecdsa-elixir/releases/tag/v1.0.1
• https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/
• https://github.com/starkbank/ecdsa-elixir/releases/tag/v1.0.1
• https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/

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