CVE-2021-28798

Relative Path Traversal Vulnerability in QTS and QuTS hero

HIGH

7.5

CVSS Score

Published: May 21, 2021 at 03:00 AM UTC

Updated: June 17, 2026 at 03:46 AM UTC

2 products affected across 1 vendorQTSQuTS hero

Using QTS by QNAP Systems Inc.?

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

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.5

Exploit prediction

EPSS 0.9%

Description

A relative path traversal vulnerability has been reported to affect QNAP NAS running QTS and QuTS hero. If exploited, this vulnerability allows attackers to modify files that impact system integrity. QNAP have already fixed this vulnerability in the following versions: QTS 4.5.2.1630 Build 20210406 and later QTS 4.3.6.1663 Build 20210504 and later QTS 4.3.3.1624 Build 20210416 and later QuTS hero h4.5.2.1638 Build 20210414 and later QNAP NAS running QTS 4.5.3 are not affected.

Affected

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

QTS · Qnap

95%

v < 4.3.3.1624 Build 20210416v < 4.3.6.1663 Build 20210504v < 4.5.2.1630 Build 202104064.3.2.0144 ≤ v < 4.3.3.16244.3.4.0000 ≤ v < 4.3.6.16634.4.0000 ≤ v < 4.5.2.1630

Affected range stops below 4.3.3.1624, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.3.3.1624 Build 20210416, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.3.6.1663, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.3.6.1663 Build 20210504, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.5.2.1630, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.5.2.1630 Build 20210406, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 4.5.3 (unaffected)

QuTS hero · Qnap

95%

v < h4.5.2.1638v < h4.5.2.1638 Build 20210414

Affected range stops below h4.5.2.1638, so it looks safe — our inference, not a vendor statement

Affected range stops below h4.5.2.1638 Build 20210414, 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/zh-tw/security-advisory/qsa-21-14

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.qnap.com/zh-tw/security-advisory/qsa-21-14

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-23CWE-284CWE-22

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