CVE-2017-4940

Name: CVE-2017-4940
Creator: NVD / NIST
Published: 2017-12-20T15:29:00.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.91%

Last modified Jun 17, 2026

CVE-2017-4940 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The ESXi Host Client in VMware ESXi (6.5 before ESXi650-201712103-SG, 5.5 before ESXi600-201711103-SG and 5.5 before ESXi550-201709102-SG) contains a vulnerability that may allow for stored cross-site scripting (XSS). An attacker can exploit this vulnerability by injecting Javascript, which might get executed when other users access the Host Client.. EPSS estimates a 0.91% chance of exploitation in the next 30 days.

Description

The ESXi Host Client in VMware ESXi (6.5 before ESXi650-201712103-SG, 5.5 before ESXi600-201711103-SG and 5.5 before ESXi550-201709102-SG) contains a vulnerability that may allow for stored cross-site scripting (XSS). An attacker can exploit this vulnerability by injecting Javascript, which might get executed when other users access the Host Client.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.91%

55.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Vmware	Esxi	5.5
Vmware	Esxi	6.0
Vmware	Esxi	6.5

References

http://www.securitytracker.com/id/1040024Third Party Advisory, VDB Entry
https://www.vmware.com/security/advisories/VMSA-2017-0021.htmlVendor Advisory
http://www.securitytracker.com/id/1040024Third Party Advisory, VDB Entry
https://www.vmware.com/security/advisories/VMSA-2017-0021.htmlVendor Advisory

Timeline

Published: Dec 20, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-4940?

How severe is CVE-2017-4940?

CVE-2017-4940 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.91% probability of exploitation in the next 30 days.

How do I fix CVE-2017-4940?

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-2017-4940?

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

Scan your code now

Source: NVD / NIST