CVE-2021-32728: The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature…

PriorityP336medium6.5CVSS 3.1

AVNACLPRLUINSUCHINAN

EPSS

0.85%

54.1th percentile

The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading.

Affected

5 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	debian_linux	—	—
debian	nextcloud-desktop	< nextcloud-desktop 3.3.1-1 (bookworm)	nextcloud-desktop 3.3.1-1 (bookworm)
nextcloud	desktop	< 3.3.0	3.3.0
nextcloud	security-advisories	< 3.3.0	3.3.0

CVSS provenance

nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvdv2.04.0MEDIUMAV:N/AC:L/Au:S/C:P/I:N/A:N

osv6.5MEDIUM

vendor_debian6.5MEDIUM

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