Is CVE-2023-28997 in the CISA KEV catalog?

No. CVE-2023-28997 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-28997?

CVE-2023-28997 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2023-28997?

CVE-2023-28997 has an EPSS score of 1.11% (62th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-28997?

Upgrade nextcloud-desktop on debian 11 to 3.1.1-2+deb11u2 or later.

CVE & CISA-KEV Catalog

CVE-2023-28997

MEDIUM

6.7

CVSS v3

NVD

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.

CWE-323

How to fix

Remediation Available

nextcloud-desktopDebian

Fixed in:3.1.1-2+deb11u2CVE-2023-28997

Fixed in:3.7.0-1CVE-2023-28997

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical

Attack ComplexityLow

Privileges RequiredHigh

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:P/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

Exploit Intelligence

1.11%probability of exploitation in 30 days

62ndpercentile

Moderate risk: more likely to be exploited than 62% of all known CVEs.

References

Patch1

github.com

Exploit1

ethz.ch

Vendor Advisory1

github.com

Other references1

lists.debian.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.