CVE-2021-34357 json
Reflected XSS Vulnerability in QmailAgent
published 2021-11-13 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21017
- cvss
- 6.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running QmailAgent. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QmailAgent: QmailAgent 3.0.2 ( 2021/08/25 ) and later
Patch / fix
- QNAP Systems Inc. QmailAgent 3.0.2 ( 2021/08/25 )
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N |
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected products
- QNAP Systems Inc. QmailAgent
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
qnap.com
/en/security-advisory/qsa-21-47
vendor-advisory
Sources
- CVE List CVE-2021-34357
- NVD CVE-2021-34357
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.