CVE-2021-28809: qnap hybrid backup sync

csirt@kutim:~/threat-intel/cve/CVE-2021-28809

CVSS 9.8 · Critical EPSS 16,1%

Kerentanan Improper Access Control pada qnap hybrid backup sync. Skor CVSS 3.1 9.8 (Critical) menurut NVD.

Deskripsi (NVD)

An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited, this vulnerability allows attackers to compromise the security of the operating system.QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.3.6: HBS 3 v3.0.210507 and later QTS 4.3.4: HBS 3 v3.0.210506 and later QTS 4.3.3: HBS 3 v3.0.210506 and later

Rincian

Terbit di NVD: 8 Juli 2021
Terakhir diubah: 17 Juni 2026
Status NVD: Modified
CVSS 3.1: 9.8 (Critical), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · uraikan di kalkulator
Jenis kelemahan (CWE): CWE-284: Improper Access Control
CWE-306: Missing Authentication for Critical Function
CWE-749: Exposed Dangerous Method or Function
EPSS (30 hari): 16,1% peluang dieksploitasi; lebih tinggi dari 96,8% CVE lain

Produk dan versi terdampak

Vendor	Produk	Versi terdampak
qnap	hybrid backup sync	Semua versi sebelum 3.0.210507
qnap	hybrid backup sync	Semua versi sebelum 3.0.210506

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

https://www.qnap.com/en/security-advisory/qsa-21-19 advisory vendor
https://www.zerodayinitiative.com/advisories/ZDI-21-783/ advisory pihak ketiga · vdb entry

Sumber: NVD · CVE.org · EPSS. Halaman ini disusun otomatis dari data tersebut; pembaruan terakhir 5 Okt 2026, 20:10 WITA. Kalau sistem di Perangkat Daerah memakai produk ini dan butuh bantuan, laporkan lewat kanal pelaporan.