Improper Handling of Unexpected Data Type in Nextcloud Server - CVE-2021-32655
Published: June 7, 2021
Vulnerability identifier: #VU53829
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32655
CWE-ID: CWE-241
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the files drop public link can be added as federated share. A remote attacker can convert a files drop link to a federated share, leading to an issue on the UI side of the sharing user.
Affected software
Nextcloud Server
How to mitigate CVE-2021-32655
Install updates from vendor's website.
Nextcloud Server - addressed in versions 19.0.11, 20.0.10, 21.0.2