CVE-2021-34359

5.4 mediumEPSS 0.6%

Medium (5.4) in qnap nas proxy server. EPSS 0.6% chance of exploitation in the next 30 days.

A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Proxy Server. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Proxy Server: QTS 4.5.x: Proxy Server 1.4.2 ( 2021/12/30 ) and later

Severity

CVSS 3.1

5.4 medium

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2022-02-25
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

qnap:nas_proxy_server

References

https://www.qnap.com/en/security-advisory/qsa-22-04
https://www.qnap.com/en/security-advisory/qsa-22-04

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