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CVE-2021-34360

27
FAUCET Score

CVE-2021-34360 is a high-severity Cross-Site Request Forgery (CSRF) vulnerability affecting QNAP Proxy Server on QTS, QuTS hero, and QuTScloud operating systems. An unauthenticated remote attacker could exploit this with low complexity by tricking a user into clicking a malicious link, leading to arbitrary code injection and potential compromise of confidentiality, integrity, and availability. While the CVSS score is 8.8 (HIGH), there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability. Patches have been released for affected versions of Proxy Server.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.4.0, < 1.4.2CPE matchmatch criteria
cpe:2.3:a:qnap:nas_proxy_server:*:*:*:*:*:*:*:*
>= 1.4.0, < 1.4.3CPE matchmatch criteria
cpe:2.3:a:qnap:nas_proxy_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
36.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0045 is in the 39th percentile among its peer group of 14,848 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 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 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

qnap.com / en/security-advisory/qsa-22-18
Vendor Advisory