Vulnerability in Starkbank Ecdsa-Python
CVE-2021-43572
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (68.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: +0.001
Affected products
Weakness classification (CWE)
References
- research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery… (Exploit, Third Party Advisory)
- github.com/starkbank/ecdsa-python/releases/tag/v2.0.1 (Third Party Advisory, Release Notes)
- github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c1… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43572?
- CVE-2021-43572 is a critical-severity vulnerability in Starkbank Ecdsa-Python, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.8/10. Published 2021-11-09.
- How severe is CVE-2021-43572?
- Critical severity. CVSS v3 base score is 9.8 out of 10.