How severe is CVE-2020-3998?

CVE-2020-3998 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-3998 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-3998?

CVE-2020-3998 affects Vmware Horizon Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-3998?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-3998 published?

CVE-2020-3998 was published on 2020-10-23 and last updated on 2026-06-17.

CVE-2020-3998

CVE-2020-3998 is a medium-severity vulnerability in Vmware Horizon Client with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Vmware Horizon Client
Published: 2020-10-23
Last modified: 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.

Frequently asked questions

What is CVE-2020-3998?: 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.
How severe is CVE-2020-3998?: CVE-2020-3998 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-3998 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-3998?: CVE-2020-3998 affects Vmware Horizon Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-3998?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-3998 published?: CVE-2020-3998 was published on 2020-10-23 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:vmware:horizon_client:*:*:*:*:*:*:*:*

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