Cyber Resilience

CVE-2023-28997

Nextcloud Desktop 3.0.0 – 3.6.5

Public PoC
Published
04 April 2023
Modified
03 November 2025
Patch / advisory
View advisory
CVSS Score v3.1 6.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
EPSS Score 0.011 63th percentile
Risk Priority 51 floored blend · peak EPSS

Summary

CVE-2023-28997 is a medium-severity Reusing a Nonce, Key Pair in Encryption (CWE-323) vulnerability in Nextcloud Desktop. Its CVSS base score is 6.7 (Medium).

Operationally, ranked in the top 37% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

OWASP Top 10 for Web (2025)

A04:2025 Cryptographic Failures

EU & UK References

Vulnerability Data

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…

more

Nextcloud Desktop client to 3.6.5 to receive a patch. No known workarounds are available.

CWE(s)
CWE-323

Related Threats

CVEs Like This One

CVE-2023-23942Same product: Nextcloud Desktop
CVE-2023-28998Same product: Nextcloud Desktop
CVE-2023-29000Same product: Nextcloud Desktop
CVE-2025-47792Same product: Nextcloud Desktop
CVE-2023-22472Same product: Nextcloud Desktop
CVE-2024-52510Same product: Nextcloud Desktop
CVE-2025-66549Same product: Nextcloud Desktop
CVE-2023-28999Same product: Nextcloud Desktop
CVE-2024-37885Same product: Nextcloud Desktop
CVE-2024-46958Same product: Nextcloud Desktop

Affected Assets

nextcloud
desktop
3.0.0 — 3.6.5

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V6.8.3
  • V11.3.4

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent nonce/key reuse errors in cryptographic implementations.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.24 Use of cryptography mostly match
prevents

Mandates proper cryptographic key and nonce management, directly preventing nonce/key-pair reuse.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect nonce reuse, yet the control addresses many other issues beyond this CWE.

A.8.28 Secure coding partial match
prevents

Secure-coding rules can require unique nonces, but the control is broader than this single weakness.

References