Medium severity · published Jun 3, 2021
CVE-2021-28807
A post-authentication reflected XSS vulnerability has been reported to affect QNAP NAS running Q’center
5.4
CVSS
1.4%
EPSS
No
On KEV
Description
A post-authentication reflected XSS vulnerability has been reported to affect QNAP NAS running Q’center. If exploited, this vulnerability allows remote attackers to inject malicious code. QNAP have already fixed this vulnerability in the following versions of Q’center: QTS 4.5.3: Q’center v1.12.1012 and later QTS 4.3.6: Q’center v1.10.1004 and later QTS 4.3.3: Q’center v1.10.1004 and later QuTS hero h4.5.2: Q’center v1.12.1012 and later QuTScloud c4.5.4: Q’center v1.12.1012 and later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 72% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QC
Q'center · Qnap
before 1.12.1012; before 1.10.1004; before 1.10.1004; before 1.12.1012; before 1.12.1012 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28807
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-28807
Vendor Advisory
https://www.qnap.com/zh-tw/security-advisory/qsa-21-20
Exploit
https://www.shielder.it/advisories/qnap-qcenter-post-auth-remote-code-execution-via-qpkg/
Exploit
https://www.shielder.it/advisories/qnap-qcenter-virtual-stored-xss/
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