What’s Vulnerable › Vulnerabilities

CVE-2023-28644: Reference fetch can saturate the server bandwidth for 10 seconds in nextcloud server

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-30 · updated 2026-06-17
• Weakness: CWE-400

Description

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.

Affected products

• Nextcloud Server: from 25.0.0 before 25.0.3 — fixed in 25.0.3

How to fix

Upgrade to a fixed version: Nextcloud Server 25.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9wmj-gp8v-477j
• https://github.com/nextcloud/server/pull/36016
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9wmj-gp8v-477j
• https://github.com/nextcloud/server/pull/36016

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