Medium severity · published Jul 12, 2021
CVE-2021-32741
Nextcloud Server is a Nextcloud package that handles data storage
5.3
CVSS
1.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
before 19.0.13; 20.0.0 before 20.0.11; 21.0.0 before 21.0.3 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32741
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32741
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-crvj-vmf7-xrvr
Patch
https://github.com/nextcloud/server/pull/26958
Permissions Required
https://hackerone.com/reports/1192144
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