CVE-2023-28997: nextcloud desktop Reusing a Nonce, Key Pair in Encryption
Vulnerability summary
CVE-2023-28997 is a medium (CVSS 6.7) Reusing a Nonce, Key Pair in Encryption vulnerability in nextcloud desktop. EPSS estimates a 1.11% chance of exploitation in the next 30 days, higher than 65.5% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 1Timeline
- 04-04-2023PublishedVulnerability first disclosed.
- 03-11-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:NDiffers
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:NDiffers
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:NDiffers
EPSS trend
Probability
1.11%
Chance of exploitation in the next 30 days
Percentile
66%
Versus all other CVEs
30-day change
0.00 pp
From 1.11% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (ethz.ch)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Nextcloud2 products
- desktop≥ 3.0.0, < 3.6.5
- security-advisories≥ 3.0.0, < 3.6.5
Debian1 product
- nextcloud-desktop< 3.7.0-1
Ubuntu1 product
- nextcloud-desktopAll versions (No fix recorded)
3 vendors · 4 products
References
7 links- github.com/nextcloud/security-advisories/security/advisories/GHSA-4p33-rw27-j5fcX Refsource CONFIRMREPORTVendor Advisory
