How severe is CVE-2020-8990?

CVE-2020-8990 has a CVSS 3.x base score of 9.1, 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 none.

Is CVE-2020-8990 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8990?

CVE-2020-8990 primarily affects Western Digital Ibi. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-8990?

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-2020-8990 published?

CVE-2020-8990 was published on 2020-02-20 and last updated on 2026-06-17.

CVE-2020-8990

CVE-2020-8990 is a critical-severity vulnerability in Western Digital Ibi with a CVSS 3.x base score of 9.1. 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-384.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-384
Affected product: Western Digital Ibi
Published: 2020-02-20
Last modified: 2026-06-17

Description

Western Digital My Cloud Home before 3.6.0 and ibi before 3.6.0 allow Session Fixation.

Frequently asked questions

What is CVE-2020-8990?: Western Digital My Cloud Home before 3.6.0 and ibi before 3.6.0 allow Session Fixation.
How severe is CVE-2020-8990?: CVE-2020-8990 has a CVSS 3.x base score of 9.1, 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 none.
Is CVE-2020-8990 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8990?: CVE-2020-8990 primarily affects Western Digital Ibi. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-8990?: 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-2020-8990 published?: CVE-2020-8990 was published on 2020-02-20 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:western_digital:ibi:*:*:*:*:*:*:*:*
cpe:2.3:a:western_digital:my_cloud_home:*:*:*:*:*:*:*:*

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