CVE-2021-43572
Improper Verification of Cryptographic Signature in starkbank-ecdsa
9.8
CRITICAL
CVSS 3.1
EPSS 0.24%
Description
The verify function in the Stark Bank Python ECDSA library (ecdsa-python) 2.0.0 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
How to fix CVE-2021-43572
To remediate CVE-2021-43572, upgrade the affected package to a fixed version below.
- PyPI/starkbank-ecdsa—upgrade to 2.0.1 or later
- —upgrade to 2.0.1 or later
Is CVE-2021-43572 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.0.1
- from 0, < 2.0.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |