CVEvulnerability
CVE-2021-43572
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2021-11-09
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 7.5 HIGH — AV:N/AC:L/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-347
Description
The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
Affected configurations
• starkbank ecdsa-python (< 2.0.1)
Related
Weakness · CWE (1)
- CWE-347 Improper Verification of Cryptographic Signature weakness
References
- https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f Patch, Third Party Advisory
- https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 Release Notes, Third Party Advisory
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/ Exploit, Third Party Advisory
- https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f Patch, Third Party Advisory
- https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 Release Notes, Third Party Advisory
- https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/ Exploit, Third Party Advisory