What is CVE-2021-34358?

CVE-2021-34358 is a medium-severity vulnerability in QNAP Nas, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.8/10. Published 2021-11-20.

How severe is CVE-2021-34358?

Medium severity. CVSS v3 base score is 6.8 out of 10.

CSRF in QNAP Nas

CVE-2021-34358

We have already fixed this vulnerability in the following versions of QmailAgent: QmailAgent 3.0.2 ( 2021/08/25 ) and later

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-11-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

QNAP Nas
QNAP Qmailagent
QNAP Systems Inc. Qmailagent — versions unspecified

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

www.qnap.com/en/security-advisory/qsa-21-49 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-34358?: CVE-2021-34358 is a medium-severity vulnerability in QNAP Nas, classified under Cross-Site Request Forgery (CSRF). CVSS score: 6.8/10. Published 2021-11-20.
How severe is CVE-2021-34358?: Medium severity. CVSS v3 base score is 6.8 out of 10.