CVE-2021-34359 | BDVDB-2026-170752 Detail

QNAP SystemsProxy Server

Description#

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

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References#

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

Exploit#

No public exploit known

History#

Version 12022-02-25Record published in the CVE List.
Version 22024-09-17Most recent update recorded in the CVE List.

Published

Published: 2022-02-25
Last modified: 2024-09-17

Vendor information

Vendor: QNAP Systems
Product: Proxy Server

All QNAP Systems vulnerabilities

Score

6.9 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 50.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 1.4.2 ( 2021/12/30 )
Fixed
1.4.2 ( 2021/12/30 )

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.9 Medium

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	High
User Interaction	Required
Scope	Changed
Confidentiality	High
Integrity	Low
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).