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CVE-2021-28802

29
FAUCET Score

CVE-2021-28802 is a critical command injection vulnerability affecting QNAP QTS and QuTS hero operating systems prior to specified versions. This flaw allows unauthenticated attackers to execute arbitrary commands on vulnerable devices, potentially leading to full system compromise. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector and low attack complexity. While no public exploits or active exploitation have been observed, and community discussion is minimal, immediate patching is strongly recommended to mitigate this high-impact vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.5.1.1540CPE matchmatch criteria
cpe:2.3:o:qnap:qts:*:*:*:*:*:*:*:*
< h4.5.1.1582CPE matchmatch criteria
cpe:2.3:o:qnap:quts_hero:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.82%
Probability of exploitation in next 30 days
EPSS Percentile
76.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0182 is in the 65th percentile among its peer group of 36,897 CVEs.

Social Chatter

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.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

qnap.com / zh-tw/security-advisory/qsa-21-29
Vendor Advisory