CVE-2021-28799 is a critical improper authorization vulnerability in QNAP NAS devices running specific versions of HBS 3 (Hybrid Backup Sync), allowing remote attackers to log in. With a CVSS score of 9.8, it presents a critical risk due to its network-based attack vector, low complexity, and complete compromise of confidentiality, integrity, and availability. This vulnerability is actively exploited, notably in ransomware campaigns, and has garnered significant community discussion and media coverage, despite the absence of public Metasploit or ExploitDB modules.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 16.0.0415CPE matchmatch criteria | cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* | ||
< 3.0.210412CPE matchmatch criteria | cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* | ||
< 3.0.210411CPE matchmatch criteria | cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* | ||
< 16.0.0419CPE matchmatch criteria | cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.