{"id":"CVE-2020-36315","aliases":["EUVD-2020-23857","GHSA-cc5x-p8hp-xch9"],"status":"published","title":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of...","description":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of the padding (and of the first two bytes) are inadequate. NOTE: this requires that a low public exponent (such as 3) is being used. The product, by default, does not generate RSA keys with such a low number.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00928,"percentile":0.60994,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-20","CWE-327"],"published":"2021-04-07T20:10:30Z","modified":"2026-10-20T14:12:23Z","products":[{"vendor":"relic_project","product":"relic"}],"references":[{"url":"https://github.com/relic-toolkit/relic/tree/32eb4c257fc80328061d66639b1cdb35dbed51a2","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://github.com/relic-toolkit/relic/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory"]},{"url":"https://github.com/relic-toolkit/relic/issues/154","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://github.com/relic-toolkit/relic/commit/76c9a1fdf19d9e92e566a77376673e522aae9f80","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36315"},{"url":"https://github.com/advisories/GHSA-cc5x-p8hp-xch9"}],"sources":{"cve":[{"id":"CVE-2020-36315","description":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of the padding (and of the first two bytes) are inadequate. NOTE: this requires that a low public exponent (such as 3) is being used. The product, by default, does not generate RSA keys with such a low number.","status":"published","published":"2021-04-07T20:10:30Z","modified":"2024-08-04T17:23:10.312Z","updated_at":"2026-11-02T14:35:55.128961Z"}],"euvd":[{"id":"EUVD-2020-23857","description":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of the padding (and of the first two bytes) are inadequate. NOTE: this requires that a low public exponent (such as 3) is being used. The product, by default, does not generate RSA keys with such a low number.","status":"published","published":"2021-04-07T20:10:30Z","modified":"2024-08-04T17:23:10Z","updated_at":"2026-11-03T03:07:03.484914Z"}],"ghsa":[{"id":"GHSA-cc5x-p8hp-xch9","title":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of...","description":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of the padding (and of the first two bytes) are inadequate. NOTE: this requires that a low public exponent (such as 3) is being used. The product, by default, does not generate RSA keys with such a low number.","status":"published","published":"2022-05-24T17:46:45Z","modified":"2023-01-27T05:03:13Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T14:42:11.706998Z"}],"nvd":[{"id":"CVE-2020-36315","description":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of the padding (and of the first two bytes) are inadequate. NOTE: this requires that a low public exponent (such as 3) is being used. The product, by default, does not generate RSA keys with such a low number.","status":"published","published":"2021-04-07T21:15:15.87Z","modified":"2026-06-17T03:15:17.36Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:06:39.25999Z"}],"osv":[{"id":"CVE-2020-36315","description":"In RELIC before 2020-08-01, RSA PKCS#1 v1.5 signature forgery can occur because certain checks of the padding (and of the first two bytes) are inadequate. NOTE: this requires that a low public exponent (such as 3) is being used. The product, by default, does not generate RSA keys with such a low number.","status":"published","published":"2021-04-07T21:15:15.87Z","modified":"2026-10-20T14:12:23.024205826Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:16.936975Z"}]}}