Resource exhaustion in Nextcloud Calendar
CVE-2023-45150
Nextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings of any length as email addresses even when megabytes of data were provided, eventually making the server busy and unresponsive. It is recommended that the Nextcloud Calendar app is upgraded to 4.4.4. The only workaround for users unable to upgrade is to disable the calendar app.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (39.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Nextcloud Calendar
- Nextcloud Security-Advisories — versions >= 1.0.0, < 4.4.4
Weakness classification (CWE)
References
- github.com/nextcloud/security-advisories/security/advisories/GHSA-r936-8gwm-w452 (Vendor Advisory)
- github.com/nextcloud/calendar/pull/5358 (Patch)
- hackerone.com/reports/2058337 (Exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2023-45150?
- CVE-2023-45150 is a medium-severity vulnerability in Nextcloud Calendar, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2023-10-16.
- How severe is CVE-2023-45150?
- Medium severity. CVSS v3 base score is 4.3 out of 10.