CVE-2021-32679

Katalog CVE

CVSS 8.8 · High EPSS 1,4%

Kerentanan Improper Encoding or Escaping of Output pada nextcloud server, fedoraproject fedora. Skor CVSS 3.1 8.8 (High) menurut NVD.

Deskripsi (NVD)

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`.

Rincian

Terbit di NVD

12 Juli 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

8.8 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-116: Improper Encoding or Escaping of Output

EPSS (30 hari)

1,4% peluang dieksploitasi; lebih tinggi dari 71,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/nextcloud/server/pull/27354 patch · advisory pihak ketiga
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3hjp-26x8-mhf6 advisory pihak ketiga
• https://security.gentoo.org/glsa/202208-17 advisory pihak ketiga
• https://hackerone.com/reports/1215263 permissions required
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DY...
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCA...