{"id":"CVE-2020-10185","aliases":["DLA-2141-1","EUVD-2020-2647","GHSA-xcc3-mxq7-rg5h","UBUNTU-CVE-2020-10185"],"status":"published","title":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an...","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","severity":{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01682,"percentile":0.77101,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-294"],"published":"2020-03-05T22:48:14Z","modified":"2026-10-20T10:51:34Z","affected":[{"source":"osv","ecosystem":"Debian:8","package":"yubikey-val","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.27-1+deb8u1"}]}],"versions":["2.27-1"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"yubikey-val","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.28-1","2.33-1","2.33-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"yubikey-val","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.38-2"]}],"products":[{"vendor":"yubico","product":"yubikey_one_time_password_validation_server"}],"references":[{"url":"https://www.yubico.com/support/security-advisories/ysa-2020-01/","tags":["x_refsource_MISC","x_transferred","Exploit","Vendor Advisory","evidence","report"]},{"url":"https://github.com/Yubico/yubikey-val/releases/tag/yubikey-val-2.40","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/03/msg00014.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-10185"},{"url":"https://github.com/advisories/GHSA-xcc3-mxq7-rg5h"},{"url":"https://ubuntu.com/security/CVE-2020-10185","tags":["report"]},{"url":"https://github.com/Yubico/yubikey-val/commit/d0e4db3245deb5ce0c8d7d26069c78071a140286","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-10185","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-10185","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","status":"published","published":"2020-03-05T22:48:14Z","modified":"2024-08-04T10:58:39.52Z","updated_at":"2026-11-02T14:35:48.213211Z"}],"euvd":[{"id":"EUVD-2020-2647","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","status":"published","published":"2020-03-05T22:48:14Z","modified":"2024-08-04T10:58:39Z","updated_at":"2026-11-03T03:07:50.893254Z"}],"ghsa":[{"id":"GHSA-xcc3-mxq7-rg5h","title":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an...","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","status":"published","published":"2022-05-24T17:10:20Z","modified":"2023-01-29T05:01:46Z","updated_at":"2026-11-02T14:44:54.429174Z"}],"nvd":[{"id":"CVE-2020-10185","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","status":"published","published":"2020-03-05T23:15:13.353Z","modified":"2026-06-17T02:47:27.52Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-294"],"updated_at":"2026-11-02T14:05:54.796125Z"}],"osv":[{"id":"CVE-2020-10185","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","status":"published","published":"2020-03-05T23:15:13.353Z","modified":"2026-10-20T10:51:34.811704306Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:13.492058Z"},{"id":"UBUNTU-CVE-2020-10185","description":"The sync endpoint in YubiKey Validation Server before 2.40 allows remote attackers to replay an OTP. NOTE: this issue is potentially relevant to persons outside Yubico who operate a self-hosted OTP validation service with a non-default configuration such as an open sync pool; the issue does NOT affect YubiCloud.","status":"published","published":"2020-03-05T23:15:00Z","modified":"2025-10-24T04:48:21Z","cvss":[{"version":"3.1","score":8.6,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:22.212782Z"},{"id":"DLA-2141-1","title":"yubikey-val - security update","status":"published","published":"2020-03-13T00:00:00Z","modified":"2026-03-09T01:20:44.235106Z","updated_at":"2026-11-02T15:46:10.227108Z"}]}}