{"id":"CVE-2023-28997","summary":"Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files","details":"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.","aliases":["GHSA-4p33-rw27-j5fc"],"modified":"2026-04-10T04:57:03.780333Z","published":"2023-04-04T12:42:24.540Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28997.json","cwe_ids":["CWE-323"],"cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/28xxx/CVE-2023-28997.json"},{"type":"ADVISORY","url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28997"},{"type":"FIX","url":"https://github.com/nextcloud/desktop/pull/5324"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nextcloud/desktop","events":[{"introduced":"ff175088a391007b66bfca89ef35cf29e37cf001"},{"fixed":"b128a778253de91443de5f57f2421963515cd469"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-28997.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N"}]}