CVE-2020-3955

Name: CVE-2020-3955
Creator: NVD / NIST
Published: 2020-04-29T03:15:18.567+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10EPSS 1.31%

Last modified Jun 17, 2026

CVE-2020-3955 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. ESXi 6.5 without patch ESXi650-201912104-SG and ESXi 6.7 without patch ESXi670-202004103-SG do not properly neutralize script-related HTML when viewing virtual machines attributes. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 8.3.. EPSS estimates a 1.31% chance of exploitation in the next 30 days.

Description

ESXi 6.5 without patch ESXi650-201912104-SG and ESXi 6.7 without patch ESXi670-202004103-SG do not properly neutralize script-related HTML when viewing virtual machines attributes. VMware has evaluated the severity of this issue to be in the Important severity range with a maximum CVSSv3 base score of 8.3.

Metrics

CVSS 3.1

9.3/10

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

EPSS Probability

1.31%

67.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Vmware	Esxi	6.5
Vmware	Esxi	6.7

References

https://www.vmware.com/security/advisories/VMSA-2020-0008.htmlPatch, Vendor Advisory
https://www.vmware.com/security/advisories/VMSA-2020-0008.htmlPatch, Vendor Advisory

Timeline

Published: Apr 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3955?

How severe is CVE-2020-3955?

CVE-2020-3955 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 1.31% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3955?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3955?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST