{"id":"CVE-2021-3990","aliases":["EUVD-2021-2596","GHSA-vrgh-5w3c-ggf8"],"status":"published","title":"Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in star7th/showdoc","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","severity":{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00891,"percentile":0.5984,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-338"],"published":"2021-12-01T10:50:10Z","modified":"2026-10-20T10:54:55Z","fixes":[{"ecosystem":"Packagist","package":"showdoc/showdoc","fixed_in":["2.9.13"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"showdoc/showdoc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.13"}]}]},{"source":"osv","ecosystem":"Packagist","package":"showdoc/showdoc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.9.13"}]}],"versions":["v1.0.0","v1.0.1","v1.0.2","v1.0.3","v1.0.4","v1.0.5","v1.1.0","v1.1.1","v1.1.3","v1.1.4","v1.1.5","v1.2.0","v1.2.1","v1.2.2","v1.2.3","v1.2.4","v1.2.5","v1.2.6","v1.3.0","v1.3.1","v1.3.3","v1.3.4","v1.3.5","v1.3.6","v1.3.7","v1.3.8","v1.4.0","v1.4.1","v1.4.2","v1.4.3","v1.4.4","v1.4.5","v1.4.6","v1.4.7","v1.5.0","v1.5.1","v1.5.2","v1.5.3","v1.6.0","v1.6.1","v1.6.2","v1.7.0","v1.7.1","v1.7.2","v1.8.0","v1.8.1","v1.8.2","v1.8.3","v1.8.4","v1.8.5","v1.8.6","v2.0","v2.0.1","v2.0.10","v2.0.2","v2.0.3","v2.0.4","v2.0.5","v2.0.6","v2.0.7","v2.0.8","v2.0.9","v2.1.0","v2.1.1","v2.1.2","v2.1.3","v2.1.4","v2.1.5","v2.2.0","v2.2.1","v2.3.0","v2.3.1","v2.3.3","v2.4.0","v2.4.1","v2.4.10","v2.4.11","v2.4.12","v2.4.13","v2.4.15","v2.4.16","v2.4.17","v2.4.2","v2.4.3","v2.4.5","v2.4.6","v2.4.7","v2.4.8","v2.4.9","v2.5.1","v2.5.2","v2.5.3","v2.5.5","v2.6.1","v2.6.2","v2.6.3","v2.6.5","v2.6.6","v2.6.7","v2.7.0","v2.7.1","v2.8.0","v2.8.1","v2.8.10","v2.8.11","v2.8.12","v2.8.13","v2.8.14","v2.8.15","v2.8.16","v2.8.2","v2.8.3","v2.8.5","v2.8.6","v2.8.7","v2.8.8","v2.8.9","v2.9.0","v2.9.1","v2.9.10","v2.9.11","v2.9.12","v2.9.2","v2.9.3","v2.9.4","v2.9.5","v2.9.6","v2.9.7","v2.9.8","v2.9.9"]}],"products":[{"vendor":"showdoc","product":"showdoc"},{"vendor":"star7th","product":"star7th/showdoc"}],"references":[{"url":"https://huntr.dev/bounties/0680067d-56a7-4412-b06e-a267e850ae9f","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/star7th/showdoc/commit/a9886f26c08225e0adca75c67dfca3f7c42b87d0","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3990","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-vrgh-5w3c-ggf8"},{"url":"https://github.com/star7th/showdoc","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2021-3990","title":"Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in star7th/showdoc","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","status":"published","published":"2021-12-01T10:50:10Z","modified":"2024-08-03T17:16:03.673Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:33:03.671751Z"}],"euvd":[{"id":"EUVD-2021-2596","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","status":"published","published":"2021-12-01T10:50:10Z","modified":"2024-08-03T17:16:03Z","cvss":[{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-03T03:25:10.888157Z"}],"ghsa":[{"id":"GHSA-vrgh-5w3c-ggf8","title":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG).","status":"published","published":"2021-12-03T20:38:50Z","modified":"2023-02-01T05:06:45Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:36:39.76883Z"}],"nvd":[{"id":"CVE-2021-3990","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","status":"published","published":"2021-12-01T11:15:07.977Z","modified":"2026-06-17T04:06:21.1Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L","level":"medium","assessor":"secondary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:07:01.811115Z"}],"osv":[{"id":"CVE-2021-3990","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","status":"published","published":"2021-12-01T11:15:07.977Z","modified":"2026-10-20T10:54:55.15096464Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:21.249056Z"},{"id":"GHSA-vrgh-5w3c-ggf8","title":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)","description":"showdoc is vulnerable to Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG).","status":"published","published":"2021-12-03T20:38:50Z","modified":"2023-11-08T04:06:43.320701Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T15:46:57.694388Z"}]}}