CVE-2021-38674

Reflected XSS Vulnerability in TFTP

MEDIUM

6.1

CVSS Score

Published: January 7, 2022 at 01:15 AM UTC

Updated: June 17, 2026 at 04:02 AM UTC

3 products affected across 1 vendorQTSQuTS heroQuTScloud

Using QuTS hero by QNAP Systems Inc.?

Get instant alerts when new vulnerabilities affect QuTS hero - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM6.1

Exploit prediction

EPSS 0.6%

Description

A cross-site scripting (XSS) vulnerability has been reported to affect QTS, QuTS hero and QuTScloud. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QTS, QuTS hero and QuTScloud: QuTS hero h4.5.4.1771 build 20210825 and later QTS 4.5.4.1787 build 20210910 and later QuTScloud c4.5.7.1864 and later

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

QTS · Qnap

95%

v < 4.5.4.1787v < 4.5.4.1787 build 20210910

Affected range stops below 4.5.4.1787, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.5.4.1787 build 20210910, so it looks safe — our inference, not a vendor statement

QuTS hero · Qnap

95%

v < h4.5.4.1771v < h4.5.4.1771 build 20210825

Affected range stops below h4.5.4.1771, so it looks safe — our inference, not a vendor statement

Affected range stops below h4.5.4.1771 build 20210825, so it looks safe — our inference, not a vendor statement

QuTScloud · Qnap

95%

v < c4.5.7.1864

Affected range stops below c4.5.7.1864, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.qnap.com/en/security-advisory/qsa-21-63

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.qnap.com/en/security-advisory/qsa-21-63

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-79

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card