Critical severity9.8NVD Advisory· Published Nov 9, 2021· Updated Jun 17, 2026
CVE-2021-43569
CVE-2021-43569
Description
The verify function in the Stark Bank .NET ECDSA library (ecdsa-dotnet) 1.3.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
starkbank-ecdsaNuGet | < 1.3.2 | 1.3.2 |
Affected products
3- cpe:2.3:a:starkbank:ecdsa-dotnet:1.3.2:*:*:*:*:*:*:*
- Stark Bank/ECDSA librarydescription
Patches
Vulnerability mechanics
References
5- research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/nvdExploitThird Party Advisory
- github.com/advisories/GHSA-j3jw-j2j8-2wv9ghsaADVISORY
- github.com/starkbank/ecdsa-dotnet/releases/tag/v1.3.2nvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-43569ghsaADVISORY
- research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-librariesghsaWEB
News mentions
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