CVE-2021-39220 LOW

CVE-2021-39220: Bypass of image blocking in Nextcloud Mail

Vendor Nextcloud
Product security-advisories
Weakness CWE-20 · Input validation
Published October 25, 2021
Last update August 4, 2024
View on NVD All CVEs

CVSS base score

3.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N

What the vulnerability does

01Description

Nextcloud is an open-source, self-hosted productivity platform The Nextcloud Mail application prior to versions 1.10.4 and 1.11.0 does by default not render images in emails to not leak the read state or user IP. The privacy filter failed to filter images with a relative protocol. It is recommended that the Nextcloud Mail application is upgraded to 1.10.4 or 1.11.0. There are no known workarounds aside from upgrading.

Key dates

02Disclosure timeline

October 25, 2021 CVE published
August 4, 2024 Record updated