Link following in QNAP Systems, Inc. products - CVE-2021-44052
Published: May 6, 2022
Vulnerability identifier: #VU62839
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-44052
CWE-ID: CWE-59
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to link following issue. A remote attacker can traverse the file system to unintended locations and read or overwrite files.
Affected software
QuTScloud
QuTS hero
QNAP QTS
QuTS hero
QNAP QTS
How to mitigate CVE-2021-44052
Install updates from vendor's website.
QuTScloud - update to c5.0.1.1998
QuTS hero - addressed in versions h4.5.4.1971 Build 20220310, h5.0.0.1986 Build 20220324
QNAP QTS - addressed in versions 4.2.6 20220304, 4.3.3.1945 20220303, 4.3.4.1976 20220303, 4.3.6.1965 20220302, 4.5.4.1991 20220329, 5.0.0.1986 20220324
QuTS hero - addressed in versions h4.5.4.1971 Build 20220310, h5.0.0.1986 Build 20220324
QNAP QTS - addressed in versions 4.2.6 20220304, 4.3.3.1945 20220303, 4.3.4.1976 20220303, 4.3.6.1965 20220302, 4.5.4.1991 20220329, 5.0.0.1986 20220324