CVE-2020-3998

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-23 · updated 2026-06-17

Description

VMware Horizon Client for Windows (5.x prior to 5.5.0) contains an information disclosure vulnerability. A malicious attacker with local privileges on the machine where Horizon Client for Windows is installed may be able to retrieve hashed credentials if the client crashes.

Affected products

VMware Horizon Server: from 5.0.0 before 5.5.0 — fixed in 5.5.0
VMware Horizon Client for Windows: from VMware Horizon Client for Windows (5.x prior through 5.5.0)

How to fix

Upgrade to a fixed version: VMware Horizon Server 5.5.0. Check the vendor advisory for mitigations.

References

https://www.vmware.com/security/advisories/VMSA-2020-0024.html
https://www.vmware.com/security/advisories/VMSA-2020-0024.html

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