CVE-2023-28997
Nextcloud Desktop: Initialization vector reuse in E2EE allows malicious server admin to break, manipulate, access files
- State
- Published
- Severity
- 6.7 Medium
- Published
- Apr 4, 2023
- Updated
- Nov 3, 2025
- Reserved
- Mar 29, 2023
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.7 Medium | CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N | GitHub_M |
Weaknesses
- CWE-323 Reusing a Nonce, Key Pair in Encryption
Affected Products
| Product | Versions |
|---|---|
security-advisoriesnextcloud |
|
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fc
- https://github.com/nextcloud/desktop/pull/5324
- https://ethz.ch/content/dam/ethz/special-interest/infk/inst-infsec/appliedcrypto/education/theses/report_DanieleCoppola.pdf
- https://lists.debian.org/debian-lts-announce/2025/09/msg00018.html
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