{"id":"CVE-2020-8150","aliases":["EUVD-2020-29044","GHSA-2q3r-568x-rqmv"],"status":"published","title":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption...","description":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.","severity":{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00289,"percentile":0.21705,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-310","CWE-311"],"published":"2020-11-09T14:19:42Z","modified":"2026-10-24T10:30:30Z","products":[{"vendor":"hackerone","product":"nextcloud server"},{"vendor":"nextcloud","product":"nextcloud_server"}],"references":[{"url":"https://hackerone.com/reports/742588","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nextcloud.com/security/advisory/?id=NC-SA-2020-039","tags":["x_refsource_MISC","x_transferred","Vendor Advisory","advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/55","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/57","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"http://seclists.org/fulldisclosure/2020/Dec/58","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8150"},{"url":"https://github.com/advisories/GHSA-2q3r-568x-rqmv"}],"sources":{"cve":[{"id":"CVE-2020-8150","description":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.","status":"published","published":"2020-11-09T14:19:42Z","modified":"2024-08-04T09:48:25.666Z","cwes":["CWE-310"],"updated_at":"2026-11-02T14:35:50.545879Z"}],"euvd":[{"id":"EUVD-2020-29044","description":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.","status":"published","published":"2020-11-09T14:19:42Z","modified":"2024-08-04T09:48:25Z","updated_at":"2026-11-03T03:07:58.055641Z"}],"ghsa":[{"id":"GHSA-2q3r-568x-rqmv","title":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption...","description":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.","status":"published","published":"2022-05-24T17:34:09Z","modified":"2023-01-29T05:05:21Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-311"],"updated_at":"2026-11-02T14:45:46.414099Z"}],"nvd":[{"id":"CVE-2020-8150","description":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.","status":"published","published":"2020-11-09T15:15:13.443Z","modified":"2026-06-17T03:25:56.803Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":1.9,"vector":"AV:L/AC:M/Au:N/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-310","CWE-311"],"updated_at":"2026-11-02T14:06:24.137599Z"}],"osv":[{"id":"CVE-2020-8150","description":"A cryptographic issue in Nextcloud Server 19.0.1 allowed an attacker to downgrade the encryption scheme and break the integrity of encrypted files.","status":"published","published":"2020-11-09T15:15:13.443Z","modified":"2026-10-24T10:30:30.486754065Z","cvss":[{"version":"3.1","score":4.1,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:17.663289Z"}]}}