CVE-2021-32728

Katalog CVE

CVSS 6.5 · Medium EPSS 0,85%

Kerentanan Improper Certificate Validation pada nextcloud desktop, debian linux. Skor CVSS 3.1 6.5 (Medium) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

18 Agustus 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-295: Improper Certificate Validation

EPSS (30 hari)

0,85% peluang dieksploitasi; lebih tinggi dari 57,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/nextcloud/desktop/pull/3338 patch · advisory pihak ketiga
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5 exploit · advisory pihak ketiga
• https://hackerone.com/reports/1189162 exploit · advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4974 advisory pihak ketiga