CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
82.6%
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 20.04 | noarch | nextcloud-desktop | < any | UNKNOWN |
ubuntu | 22.04 | noarch | nextcloud-desktop | < any | UNKNOWN |
github.com/nextcloud/desktop/pull/3338
github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5
hackerone.com/reports/1189162
launchpad.net/bugs/cve/CVE-2021-32728
nvd.nist.gov/vuln/detail/CVE-2021-32728
security-tracker.debian.org/tracker/CVE-2021-32728
www.cve.org/CVERecord?id=CVE-2021-32728
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:L/Au:S/C:P/I:N/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS
Percentile
82.6%