How severe is CVE-2021-34356?

CVE-2021-34356 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2021-34356 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34356?

CVE-2021-34356 affects Qnap Photo Station. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34356?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-34356 published?

CVE-2021-34356 was published on 2021-10-01 and last updated on 2026-06-17.

CVE-2021-34356

CVE-2021-34356 is a high-severity vulnerability in Qnap Photo Station with a CVSS 3.x base score of 7.6. 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-79.

Key facts

Severity: High (CVSS 3.x base score 7.6)
CVSS v2: 3.5
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Qnap Photo Station
Published: 2021-10-01
Last modified: 2026-06-17

Description

A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Photo Station. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Photo Station: Photo Station 6.0.18 ( 2021/09/01 ) and later

Frequently asked questions

What is CVE-2021-34356?: A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Photo Station. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Photo Station: Photo Station 6.0.18 ( 2021/09/01 ) and later
How severe is CVE-2021-34356?: CVE-2021-34356 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2021-34356 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34356?: CVE-2021-34356 affects Qnap Photo Station. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34356?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-34356 published?: CVE-2021-34356 was published on 2021-10-01 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-21-41

Affected products (1)

cpe:2.3:a:qnap:photo_station:*:*:*:*:*:*:*:*

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