CVE-2021-28807: qnap systems inc. q’center Cross-site Scripting
Vulnerability summary
CVE-2021-28807 is a high (CVSS 7.7) Cross-site Scripting vulnerability in qnap systems inc. q’center. EPSS estimates a 1.38% chance of exploitation in the next 30 days, higher than 71.7% of scored vulnerabilities. 2 public exploits are recorded.
Timeline
- 03-06-2021PublishedVulnerability first disclosed.
- 16-09-2024Last modifiedVulnerability information updated.
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 metrics
3 scores · 2 sources · 2 versions- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NDiffers
EPSS trend
Probability
1.38%
Chance of exploitation in the next 30 days
Percentile
72%
Versus all other CVEs
30-day change
0.00 pp
From 1.38% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (shielder.it)
Maturity: unknown
Exploit Reference (shielder.it)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Qnap1 product
- q\'center< 1.12.1012 | < 1.10.1004
Qnap systems inc.1 product
- q’center≥ unspecified, < v1.12.1012 | ≥ unspecified, < v1.10.1004
2 vendors · 2 products
References
3 links- www.shielder.it/advisories/qnap-qcenter-virtual-stored-xss/X Refsource MISCExploitThird Party Advisory
- www.shielder.it/advisories/qnap-qcenter-post-auth-remote-code-execution-via-qpkg/X Refsource MISCExploitThird Party Advisory