{"id":"CVE-2021-25761","aliases":["EUVD-2021-12644","GHSA-w76f-c56x-cr72"],"status":"published","title":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","description":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00548,"percentile":0.46341,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-326","CWE-327"],"published":"2021-02-03T15:21:13Z","modified":"2026-10-24T10:30:42Z","products":[{"vendor":"jetbrains","product":"ktor"}],"references":[{"url":"https://blog.jetbrains.com","tags":["x_refsource_MISC","x_transferred","Product","article"]},{"url":"https://blog.jetbrains.com/blog/2021/02/03/jetbrains-security-bulletin-q4-2020/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25761"},{"url":"https://github.com/advisories/GHSA-w76f-c56x-cr72"}],"sources":{"cve":[{"id":"CVE-2021-25761","description":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","status":"published","published":"2021-02-03T15:21:13Z","modified":"2024-08-03T20:11:28.065Z","updated_at":"2026-11-02T14:32:59.430294Z"}],"euvd":[{"id":"EUVD-2021-12644","description":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","status":"published","published":"2021-02-03T15:21:13Z","modified":"2024-08-03T20:11:28Z","updated_at":"2026-11-03T03:24:52.420769Z"}],"ghsa":[{"id":"GHSA-w76f-c56x-cr72","title":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","description":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","status":"published","published":"2022-05-24T17:40:51Z","modified":"2023-08-08T15:31:16Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:54:43.567376Z"}],"nvd":[{"id":"CVE-2021-25761","description":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","status":"published","published":"2021-02-03T16:15:14.633Z","modified":"2026-06-17T03:42:24.663Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-326"],"updated_at":"2026-11-02T14:06:49.660551Z"}],"osv":[{"id":"CVE-2021-25761","description":"In JetBrains Ktor before 1.5.0, a birthday attack on SessionStorage key was possible.","status":"published","published":"2021-02-03T16:15:14.633Z","modified":"2026-10-24T10:30:42.353162868Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:18.778776Z"}]}}