{"id":"CVE-2021-20305","revision":null,"records":[{"revision":"0e24282916d6426bb3b56d39d81fbfe8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2021-20305","aliases":[],"title":"A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scal…","description":"A flaw was found in Nettle in versions before 3.7.2, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point (ECC) multiply function being called with out-of-range scalers, possibly resulting in incorrect results. This flaw allows an attacker to force an invalid signature, causing an assertion failure or possible validation. The highest threat to this vulnerability is to confidentiality, integrity, as well as system availability.","state":0,"publishedAt":"2021-04-05T21:31:06+00:00","modifiedAt":"2026-10-14T10:04:15.674+00:00","affected":[{"ecosystem":"Vendor product","name":"nettle","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"nettle\",\n                    \"vendor\": \"n/a\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"nettle 3.7.2\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1942533","https://security.gentoo.org/glsa/202105-31","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQKWVVMAIDAJ7YAA3VVO32BHLDOH2E63/","https://www.debian.org/security/2021/dsa-4933","https://lists.debian.org/debian-lts-announce/2021/09/msg00008.html","https://security.netapp.com/advisory/ntap-20211022-0002/"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2021-20305","license":"CVE Program Terms of Use","key":"cve-program:CVE-2021-20305","identifiers":["CVE-2021-20305"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-10T05:04:17.0540934+00:00","complete":true,"records":1773,"lastAttemptAt":"2026-11-10T05:04:17.0540934+00:00","lastSuccessAt":"2026-11-10T05:04:18.9657904+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:04:18.9657907+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-8859cf40d4337e24bd2f258cc7778fbad01bb24c79d057aaf34cf1dfc6f8917d-77fffadfbb8fd9043950d68e58e30483f52900409642c6b646065548479c26cc","complete":true,"records":421868,"lastAttemptAt":"2026-11-10T05:02:16.4823631+00:00","lastSuccessAt":"2026-11-10T05:02:16.4560546+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:02:16.4823631+00:00","snapshotPublishedAt":"2026-11-10T04:28:56+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-a6dc967b5ceb4c488191e8f172ded5d6","complete":true,"records":13689,"lastAttemptAt":"2026-11-10T05:06:09.4504083+00:00","lastSuccessAt":"2026-11-10T03:04:49.903+00:00","error":null,"lastVerifiedAt":"2026-11-10T03:04:49.903+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13742,"expectedIdentifiers":13742,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-10T05:04:17.0540934+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-10T05:04:17.0540934+00:00","lastSuccessAt":"2026-11-10T05:04:18.9669147+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:04:18.9669149+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-0cb393c0854647ceaeade74220bf537d","complete":false,"records":13695,"lastAttemptAt":"2026-11-10T05:06:08.8352765+00:00","lastSuccessAt":"2026-11-10T05:06:08.831+00:00","error":"100 identifier lookups failed; latest failures include request timeout. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-10T05:06:08.831+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13642,"expectedIdentifiers":13742,"failedIdentifiers":100},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-cdffb4589856378aa42e8d1bd4a6c74e27a180d8160bf764c44715ef760f0a62","complete":true,"records":9932,"lastAttemptAt":"2026-11-10T05:04:16.277674+00:00","lastSuccessAt":"2026-11-10T00:04:19.8260565+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:04:16.277674+00:00","snapshotPublishedAt":"2026-11-09T23:48:01+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-26503967ae4379db8f374089589d6e03fb15bd31f820c9e992aaf93840c2236c","complete":true,"records":1971,"lastAttemptAt":"2026-11-10T05:02:16.7857429+00:00","lastSuccessAt":"2026-11-09T21:02:20.472473+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:02:16.7857429+00:00","snapshotPublishedAt":"2026-11-09T20:18:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-761ecc9061239b0da572dc9254c6f384c1d19339eb08408c436647a2f26129e9","complete":true,"records":3064,"lastAttemptAt":"2026-11-10T05:04:16.6684448+00:00","lastSuccessAt":"2026-11-09T17:05:03.4044794+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:04:16.6684448+00:00","snapshotPublishedAt":"2026-11-09T16:33:20+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-df80ce3f4ee69a086fc0f8e2d917e586081af2af4d81ef20f64f97855436e748","complete":true,"records":231583,"lastAttemptAt":"2026-11-10T05:04:16.1480624+00:00","lastSuccessAt":"2026-11-10T05:04:14.7294031+00:00","error":null,"lastVerifiedAt":"2026-11-10T05:04:16.1480624+00:00","snapshotPublishedAt":"2026-11-10T04:33:09+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}