{"id":"CVE-2019-5440","aliases":["EUVD-2019-15028","GHSA-38m3-mrrg-hx5g"],"status":"published","title":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c...","description":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.","severity":{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01579,"percentile":0.7567,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-338"],"published":"2019-05-28T18:41:05Z","modified":"2026-10-24T10:31:01Z","products":[{"vendor":"revive","product":"revive adserver"},{"vendor":"revive-adserver","product":"revive_adserver"}],"references":[{"url":"https://hackerone.com/reports/576504","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-5440"},{"url":"https://github.com/advisories/GHSA-38m3-mrrg-hx5g"}],"sources":{"cve":[{"id":"CVE-2019-5440","description":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.","status":"published","published":"2019-05-28T18:41:05Z","modified":"2024-08-04T19:54:53.582Z","cwes":["CWE-338"],"updated_at":"2026-11-02T14:20:18.746972Z"}],"euvd":[{"id":"EUVD-2019-15028","description":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.","status":"published","published":"2019-05-28T18:41:05Z","modified":"2024-08-04T19:54:53Z","updated_at":"2026-11-03T03:06:52.441304Z"}],"ghsa":[{"id":"GHSA-38m3-mrrg-hx5g","title":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c...","description":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality.","status":"published","published":"2022-05-24T16:46:47Z","modified":"2024-04-04T00:49:10Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-338"],"updated_at":"2026-11-02T14:55:52.162148Z"}],"nvd":[{"id":"CVE-2019-5440","description":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.","status":"published","published":"2019-05-28T19:29:06.19Z","modified":"2026-06-17T02:37:41.66Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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-338"],"updated_at":"2026-11-02T14:05:14.729983Z"}],"osv":[{"id":"CVE-2019-5440","description":"Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver \u003c v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.","status":"published","published":"2019-05-28T19:29:06.19Z","modified":"2026-10-24T10:31:01.475403923Z","cvss":[{"version":"3.0","score":8.1,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:12.675558Z"}]}}