How severe is CVE-2021-20655?

CVE-2021-20655 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-20655 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20655?

CVE-2021-20655 affects Soliton Filezen. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20655?

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-2021-20655 published?

CVE-2021-20655 was published on 2021-02-17 and last updated on 2026-06-17.

CVE-2021-20655

CVE-2021-20655 is a high-severity vulnerability in Soliton Filezen with a CVSS 3.x base score of 7.2. 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-78.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 9.0
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Soliton Filezen
Published: 2021-02-17
Last modified: 2026-06-17

Description

FileZen (V3.0.0 to V4.2.7 and V5.0.0 to V5.0.2) allows a remote attacker with administrator rights to execute arbitrary OS commands via unspecified vectors.

Frequently asked questions

What is CVE-2021-20655?: FileZen (V3.0.0 to V4.2.7 and V5.0.0 to V5.0.2) allows a remote attacker with administrator rights to execute arbitrary OS commands via unspecified vectors.
How severe is CVE-2021-20655?: CVE-2021-20655 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-20655 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20655?: CVE-2021-20655 affects Soliton Filezen. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20655?: 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-2021-20655 published?: CVE-2021-20655 was published on 2021-02-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:soliton:filezen:*:*:*:*:*:*:*:*

More vulnerabilities in Soliton Filezen

CVE-2020-5639 — Critical (CVSS 9.8): Directory traversal vulnerability in FileZen versions from V3.0.0 to V4.2.2 allows remote attackers to upload an…
CVE-2018-0694 — Critical (CVSS 9.8): FileZen V3.0.0 to V4.2.1 allows remote attackers to execute arbitrary OS commands via unspecified vectors.
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CVE-2018-0693 — High (CVSS 7.5): Directory traversal vulnerability in FileZen V3.0.0 to V4.2.1 allows remote attackers to upload an arbitrary file in…

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