Security readout for executives and security teams
Plain-English summary
QNAP NAS operating systems had an open redirect flaw that could send a user from a trusted QNAP device page to a malicious site. The issue requires user interaction, so it is more phishing-enablement than direct device compromise. QNAP says it is fixed in listed QuTScloud, QuTS hero, and QTS releases.
Executive priority
Handle as a moderate-priority maintenance and phishing-risk issue. It is not described as a direct remote takeover, but trusted infrastructure links can increase user deception risk. Prioritize internet-facing or broadly used QNAP systems first.
Technical view
CVE-2021-44054 is a CWE-601 open redirect affecting QNAP QuTScloud, QuTS hero, and QTS. CVSS 3.1 is 4.3: network reachable, low complexity, no privileges required, user interaction required, with limited confidentiality impact and no stated integrity or availability impact.
Likely exposure
Exposure is most relevant where QNAP management or user-facing web interfaces are reachable by users and trusted in workflows. The source bundle does not define exact vulnerable version ranges, only affected product families and fixed versions.
Exploitation context
The source bundle and KEV flag do not indicate known active exploitation. QNAP describes a scenario where attackers redirect users to an untrusted page containing malware, but no public exploit details are provided in the supplied sources.
Researcher notes
The supplied evidence does not include vulnerable endpoint names, request parameters, proof-of-concept details, or exact vulnerable version ranges. Validation should stay focused on version posture and exposure mapping, not exploit reproduction.
Mitigation direction
- Upgrade QuTScloud to c5.0.1.1949 or later.
- Upgrade QuTS hero h5 to h5.0.0.1949 build 20220215 or later.
- Upgrade QuTS hero h4.5 to h4.5.4.1951 build 20220218 or later.
- Upgrade QTS 5 to 5.0.0.1986 build 20220324 or later.
- Upgrade QTS 4.5 to 4.5.4.1991 build 20220329 or later.
- Check QNAP advisory QSA-22-16 for current vendor guidance.
Validation and detection
- Inventory QNAP devices running QuTScloud, QuTS hero, or QTS.
- Compare installed versions against the fixed versions in QNAP QSA-22-16.
- Confirm administrative web interfaces are not unnecessarily exposed to untrusted networks.
- Review recent security awareness or phishing reports involving trusted QNAP links.
- Document devices that cannot be upgraded and seek vendor-supported compensating guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-601: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-44054 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.qnap.com/en/security-advisory/qsa-22-16CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
URL Redirection to Untrusted Site ('Open Redirect')
URL Redirection to Untrusted Site ('Open Redirect') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.