{"id":"CVE-2023-28997","aliases":["ALPINE-CVE-2023-28997","DEBIAN-CVE-2023-28997","DLA-4303-1","EUVD-2023-32615","GHSA-4p33-rw27-j5fc","UBUNTU-CVE-2023-28997"],"status":"published","title":"Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","severity":{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01072,"percentile":0.65323,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-323"],"published":"2023-04-04T12:42:24Z","modified":"2026-11-03T06:32:58Z","fixes":[{"ecosystem":"Alpine:v3.18","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"nextcloud-client","fixed_in":["3.6.6-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"nextcloud-desktop","fixed_in":["3.7.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"nextcloud-desktop","fixed_in":["3.7.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"nextcloud-desktop","fixed_in":["3.7.0-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.18","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"nextcloud-client","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6.6-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"nextcloud-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"nextcloud-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"nextcloud-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.0-1"}]}]},{"source":"osv","ecosystem":"Debian:11","package":"nextcloud-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.1-2+deb11u2"}]}],"versions":["3.1.1-2","3.1.1-2+deb11u1"],"bundled":5},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"nextcloud-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.3-1","2.6.0-1","2.6.1-1","2.6.1-2","2.6.2-1","2.6.2-1build1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"nextcloud-desktop","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.3-0ubuntu1","3.3.5-1","3.3.5-1ubuntu1","3.4.2-1","3.4.2-1ubuntu1"]}],"products":[{"vendor":"kiteworks","product":"security-advisories"},{"vendor":"nextcloud","product":"desktop"},{"vendor":"nextcloud","product":"security-advisories"}],"references":[{"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory","advisory","report"]},{"url":"https://github.com/nextcloud/desktop/pull/5324","tags":["x_refsource_MISC","x_transferred","Patch","fix","report"]},{"url":"https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf","tags":["x_refsource_MISC","x_transferred","Exploit","Technical Description","Third Party Advisory","web","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html","tags":["web"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2023-28997","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28997.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28997","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-28997","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-28997","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-28997","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2023-28997","title":"Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T12:42:24.54Z","modified":"2025-11-03T18:08:06.573Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-323"],"updated_at":"2026-11-02T14:35:32.376766Z"}],"euvd":[{"id":"EUVD-2023-32615","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T12:42:24Z","modified":"2025-11-03T18:08:06Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T19:49:34.635725Z"}],"nvd":[{"id":"CVE-2023-28997","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T13:15:08.867Z","modified":"2026-06-17T05:49:09.31Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-323"],"updated_at":"2026-11-02T14:07:51.883939Z"}],"osv":[{"id":"ALPINE-CVE-2023-28997","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T13:15:08.867Z","modified":"2026-11-03T06:32:58.958566188Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-03T07:16:09.603409Z"},{"id":"CVE-2023-28997","title":"Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T12:42:24.54Z","modified":"2026-10-28T02:30:30.62405482Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-323"],"updated_at":"2026-11-02T15:44:31.468318Z"},{"id":"DEBIAN-CVE-2023-28997","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T13:15:08.867Z","modified":"2026-10-26T18:01:24.440964778Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:39.679062Z"},{"id":"UBUNTU-CVE-2023-28997","description":"The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server. Starting with version 3.0.0 and prior to version 3.6.5, a malicious server administrator can recover and modify the contents of end-to-end encrypted files. Users should upgrade the Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.","status":"published","published":"2023-04-04T13:15:00Z","modified":"2026-04-22T14:04:47.982119Z","cvss":[{"version":"3.1","score":6.7,"vector":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"updated_at":"2026-11-02T16:54:20.997471Z"},{"id":"DLA-4303-1","title":"nextcloud-desktop - security update","status":"published","published":"2025-09-18T00:00:00Z","modified":"2026-03-09T02:08:32.445562Z","updated_at":"2026-11-02T15:46:12.7027Z"}]}}