CVE-2021-32727

Katalog CVE

CVSS 7.5 · High EPSS 0,73%

Kerentanan Improper Certificate Validation pada nextcloud. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.

Rincian

Terbit di NVD

12 Juli 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

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

Jenis kelemahan (CWE)

CWE-295: Improper Certificate Validation

EPSS (30 hari)

0,73% peluang dieksploitasi; lebih tinggi dari 53,1% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/nextcloud/android/pull/8438 advisory pihak ketiga
• https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#fu... advisory pihak ketiga
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5v33-r9cm-7736 advisory pihak ketiga
• https://hackerone.com/reports/1189162 permissions required