What is CVE-2021-32741?

CVE-2021-32741 is a medium-severity vulnerability in Nextcloud Server, classified under CWE-799. CVSS score: 5.3/10. Published 2021-07-12.

How severe is CVE-2021-32741?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Nextcloud Server

CVE-2021-32741

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.011, and 21.0.3, there was a lack of ratelimiting on the public share link mount endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. The issue was fixed in versions 19.0.13, 20.0.11, and 21.0.3. There are no known workarounds.

Published 2021-07-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (69.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions < 19.0.13, >= 20.0.0, < 20.0.11, >= 21.0.0, < 21.0.3

Weakness classification (CWE)

CWE-799

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-crvj-vmf7-xrvr (Third Party Advisory)
github.com/nextcloud/server/pull/26958 (Patch, Third Party Advisory)
hackerone.com/reports/1192144 (Permissions Required)

Frequently asked questions

What is CVE-2021-32741?: CVE-2021-32741 is a medium-severity vulnerability in Nextcloud Server, classified under CWE-799. CVSS score: 5.3/10. Published 2021-07-12.
How severe is CVE-2021-32741?: Medium severity. CVSS v3 base score is 5.3 out of 10.