CVE-2021-34357

6.1 mediumEPSS 0.7%

Medium (6.1) in qnap qmailagent. EPSS 0.7% chance of exploitation in the next 30 days.

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

Severity

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 53% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-11-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

qnap:qmailagent

References

https://www.qnap.com/en/security-advisory/qsa-21-47
https://www.qnap.com/en/security-advisory/qsa-21-47

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