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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.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43572","reference_id":"","reference_type":"","scores":[{"value":"0.00241","scoring_system":"epss","scoring_elements":"0.47547","published_at":"2026-06-08T12:55:00Z"},{"value":"0.00241","scoring_system":"epss","scoring_elements":"0.4756","published_at":"2026-06-09T12:55:00Z"},{"value":"0.00241","scoring_system":"epss","scoring_elements":"0.47592","published_at":"2026-06-05T12:55:00Z"},{"value":"0.00241","scoring_system":"epss","scoring_elements":"0.47528","published_at":"2026-06-04T12:55:00Z"},{"value":"0.00241","scoring_system":"epss","scoring_elements":"0.47594","published_at":"2026-06-06T12:55:00Z"},{"value":"0.00241","scoring_system":"epss","scoring_elements":"0.47577","published_at":"2026-06-07T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-43572"},{"reference_url":"https://github.com/advisories/GHSA-92vm-mxjf-jqf3","reference_id":"","reference_type":"","scores":[{"value":"CRITICAL","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-92vm-mxjf-jqf3"},{"reference_url":"https://github.com/pypa/advisory-database/tree/main/vulns/starkbank-ecdsa/PYSEC-2021-426.yaml","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/pypa/advisory-database/tree/main/vulns/starkbank-ecdsa/PYSEC-2021-426.yaml"},{"reference_url":"https://github.com/starkbank/ecdsa-python","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/starkbank/ecdsa-python"},{"reference_url":"https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/starkbank/ecdsa-python/commit/d136170666e9510eb63c2572551805807bd4c17f"},{"reference_url":"https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/starkbank/ecdsa-python/releases/tag/v2.0.1"},{"reference_url":"https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries","reference_id":"","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries"},{"reference_url":"https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/","reference_id":"","reference_type":"","scores":[],"url":"https://research.nccgroup.com/2021/11/08/technical-advisory-arbitrary-signature-forgery-in-stark-bank-ecdsa-libraries/"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43572","reference_id":"CVE-2021-43572","reference_type":"","scores":[{"value":"9.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43572"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/24907?format=json","purl":"pkg:pypi/starkbank-ecdsa@2.0.1","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/starkbank-ecdsa@2.0.1"}],"aliases":["CVE-2021-43572","GHSA-92vm-mxjf-jqf3","PYSEC-2021-426"],"risk_score":4.5,"exploitability":"0.5","weighted_severity":"9.0","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-v8tp-qs9w-w7fc"}],"fixing_vulnerabilities":[],"risk_score":"4.5","resource_url":"http://public2.vulnerablecode.io/packages/pkg:pypi/starkbank-ecdsa@0.1.5"}