CVE-2021-32679: Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in…

PriorityP345high8.8CVSS 3.1

AVNACLPRNUIRSUCHIHAH

EPSS

1.37%

68.5th percentile

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in controllers using `DownloadResponse`. When a user-supplied filename was passed unsanitized into a `DownloadResponse`, this could be used to trick users into downloading malicious files with a benign file extension. This would show in UI behaviours where Nextcloud applications would display a benign file extension (e.g. JPEG), but the file will actually be downloaded with an executable file extension. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. Administrators of Nextcloud instances do not have a workaround available, but developers of Nextcloud apps may manually escape the file name before passing it into `DownloadResponse`.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
fedoraproject	fedora	—	—
fedoraproject	fedora	—	—
nextcloud	nextcloud_server	< 19.0.13	19.0.13
nextcloud	nextcloud_server	>= 20.0.0 < 20.0.11	20.0.11
nextcloud	nextcloud_server	>= 21.0.0 < 21.0.3	21.0.3
nextcloud	security-advisories	< 19.0.13	19.0.13
nextcloud	security-advisories	—	—
nextcloud	security-advisories	—	—

CVSS provenance

nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvdv2.06.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.