How severe is CVE-2020-27158?

CVE-2020-27158 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-27158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-27158?

CVE-2020-27158 affects Westerndigital My Cloud Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-27158?

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

When was CVE-2020-27158 published?

CVE-2020-27158 was published on 2020-10-27 and last updated on 2026-06-17.

CVE-2020-27158

CVE-2020-27158 is a critical-severity vulnerability in Westerndigital My Cloud Firmware with a CVSS 3.x base score of 9.8. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Westerndigital My Cloud Firmware
Published: 2020-10-27
Last modified: 2026-06-17

Description

Addressed remote code execution vulnerability in cgi_api.php that allowed escalation of privileges in Western Digital My Cloud NAS devices prior to 5.04.114.

Frequently asked questions

What is CVE-2020-27158?: Addressed remote code execution vulnerability in cgi_api.php that allowed escalation of privileges in Western Digital My Cloud NAS devices prior to 5.04.114.
How severe is CVE-2020-27158?: CVE-2020-27158 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-27158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-27158?: CVE-2020-27158 affects Westerndigital My Cloud Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-27158?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2020-27158 published?: CVE-2020-27158 was published on 2020-10-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:westerndigital:my_cloud_firmware:*:*:*:*:*:*:*:*

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