Vulnerability in Nextcloud Server
CVE-2023-32320
Nextcloud Server is a data storage system for Nextcloud, a self-hosted productivity platform. When multiple requests are sent in parallel, all of them were executed even if the amount of faulty requests succeeded the limit by the time the response was sent to the client. This allowed someone to send as many requests the server could handle in parallel to bruteforce protected details instead of the configured limit, default 8. Nextcloud Server versions 25.0.7 and 26.0.2 and Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7 and 26.0.2 contain patches for this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Nextcloud Server
- Nextcloud Security-Advisories — versions Nextcloud Server >= 25.0.0, < 25.0.7, Nextcloud Server >= 26.0.0, < 26.0.2, Nextcloud Enterprise Server >= 21.0.0, < 21.0.9.12
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-qphh-6xh7-vffg (Patch, Vendor Advisory)
- github.com/nextcloud/server/pull/38274 (Patch)
- hackerone.com/reports/1918525 (Permissions Required)
Frequently asked questions
- What is CVE-2023-32320?
- CVE-2023-32320 is a high-severity vulnerability in Nextcloud Server, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 8.7/10. Published 2023-06-22.
- How severe is CVE-2023-32320?
- High severity. CVSS v3 base score is 8.7 out of 10.