CVE-2021-28809 is an improper access control vulnerability affecting legacy versions of QNAP HBS 3 and QTS, allowing attackers to compromise the operating system. With a CVSS score of 9.8 (Critical), this vulnerability is easily exploitable over the network without authentication, leading to complete compromise of confidentiality, integrity, and availability. While not listed on CISA's KEV catalog, it has garnered some community discussion and media coverage, though no public exploit code (Metasploit, Nuclei, ExploitDB) is currently available.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.0.210507CPE matchmatch criteria | cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* | ||
< 3.0.210506CPE 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:U/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.