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CVE-2020-8990

22
FAUCET Score

CVE-2020-8990 describes a critical session fixation vulnerability (CWE-384) affecting Western Digital My Cloud Home and ibi devices prior to version 3.6.0. This flaw allows an attacker to hijack a legitimate user's session, potentially leading to unauthorized access to sensitive data and system manipulation. With a CVSS score of 9.1 (CRITICAL), the vulnerability is easily exploitable over the network without user interaction. While no public exploits or active exploitation have been observed, and community discussion is minimal, the high severity warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.6.0CPE matchmatch criteria
cpe:2.3:a:western_digital:ibi:*:*:*:*:*:*:*:*
< 3.6.0CPE matchmatch criteria
cpe:2.3:a:western_digital:my_cloud_home:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.00%
Probability of exploitation in next 30 days
EPSS Percentile
59.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0100 is in the 44th percentile among its peer group of 36,835 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

support.wdc.com / downloads.aspx
PatchVendor Advisory
westerndigital.com / support/productsecurity/wdc-19013-my-cloud-home-and-ibi-session-invalidation-vulnerability
Vendor Advisory