What is CVE-2023-28644?

CVE-2023-28644 is a medium-severity vulnerability in Nextcloud Server, classified under Uncontrolled Resource Consumption. CVSS score: 5.7/10. Published 2023-03-30.

How severe is CVE-2023-28644?

Medium severity. CVSS v3 base score is 5.7 out of 10.

Resource exhaustion in Nextcloud Server

CVE-2023-28644

Nextcloud server is an open source home cloud implementation. In releases of the 25.0.x branch before 25.0.3 an inefficient fetch operation may impact server performances and/or can lead to a denial of service. This issue has been addressed and it is recommended that the Nextcloud Server is upgraded to 25.0.3. There are no known workarounds for this vulnerability.

Vulnerability class: DoS (Denial of Service)

Published 2023-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions >= 25.0.0, < 25.0.3

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-9wmj-gp8v-477j (Vendor Advisory)
github.com/nextcloud/server/pull/36016 (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2023-28644?: CVE-2023-28644 is a medium-severity vulnerability in Nextcloud Server, classified under Uncontrolled Resource Consumption. CVSS score: 5.7/10. Published 2023-03-30.
How severe is CVE-2023-28644?: Medium severity. CVSS v3 base score is 5.7 out of 10.