How severe is CVE-2021-34358?

CVE-2021-34358 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-34358 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34358?

CVE-2021-34358 affects Qnap Qmailagent. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34358?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34358 published?

CVE-2021-34358 was published on 2021-11-20 and last updated on 2026-06-17.

CVE-2021-34358

CVE-2021-34358 is a medium-severity vulnerability in Qnap Qmailagent with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-352.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 6.8
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Qnap Qmailagent
Published: 2021-11-20
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-34358?: We have already fixed this vulnerability in the following versions of QmailAgent: QmailAgent 3.0.2 ( 2021/08/25 ) and later
How severe is CVE-2021-34358?: CVE-2021-34358 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-34358 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34358?: CVE-2021-34358 affects Qnap Qmailagent. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34358?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34358 published?: CVE-2021-34358 was published on 2021-11-20 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-21-49

Affected products (1)

cpe:2.3:a:qnap:qmailagent:*:*:*:*:*:*:*:*

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