What is CVE-2020-8990?

CVE-2020-8990 is a critical-severity vulnerability in Western Digital Ibi, classified under Session Fixation. CVSS score: 9.1/10. Published 2020-02-20.

How severe is CVE-2020-8990?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Western Digital Ibi

CVE-2020-8990

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

Published 2020-02-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.3th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-384 — Session Fixation

References

support.wdc.com/downloads.aspx (Patch, Vendor Advisory)
www.westerndigital.com/support/productsecurity/wdc-19013-my-cloud-home-and-ibi-… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-8990?: CVE-2020-8990 is a critical-severity vulnerability in Western Digital Ibi, classified under Session Fixation. CVSS score: 9.1/10. Published 2020-02-20.
How severe is CVE-2020-8990?: Critical severity. CVSS v3 base score is 9.1 out of 10.