How severe is CVE-2021-29091?

CVE-2021-29091 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-29091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29091?

CVE-2021-29091 affects Synology Photo Station. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29091?

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-2021-29091 published?

CVE-2021-29091 was published on 2021-06-02 and last updated on 2026-06-17.

CVE-2021-29091

CVE-2021-29091 is a high-severity vulnerability in Synology Photo Station with a CVSS 3.x base score of 7.7. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v2: 4.0
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Synology Photo Station
Published: 2021-06-02
Last modified: 2026-06-17

Description

Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in file management component in Synology Photo Station before 6.8.14-3500 allows remote authenticated users to write arbitrary files via unspecified vectors.

Frequently asked questions

What is CVE-2021-29091?: Improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in file management component in Synology Photo Station before 6.8.14-3500 allows remote authenticated users to write arbitrary files via unspecified vectors.
How severe is CVE-2021-29091?: CVE-2021-29091 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-29091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29091?: CVE-2021-29091 affects Synology Photo Station. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29091?: 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-2021-29091 published?: CVE-2021-29091 was published on 2021-06-02 and last updated on 2026-06-17.

References

https://www.synology.com/security/advisory/Synology_SA_20_20

Affected products (1)

cpe:2.3:a:synology:photo_station:*:*:*:*:*:*:*:*

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