CVE-2017-4940: VMware ESXi vulnerability

CVE-2017-4940: The ESXi Host Client in VMware ESXi (6.5 before ESXi650-201712103-SG, 5.5 before ESXi600-201711103-SG and 5...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 17, 2024, 03:02 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2017-4940 is a stored cross-site scripting issue in the VMware ESXi Host Client. If an attacker can save malicious JavaScript into affected ESXi host data, it may run later in another user's Host Client session. The main business concern is abuse of administrator browser sessions for hosts that remain on old ESXi builds. Exposure is limited to organizations still running affected VMware ESXi 6.5, 6.0, or 5.5 builds and allowing users to access the Host Client. Internet-exposed or broadly reachable management interfaces would increase concern, but the bundle does not state exposure requirements. Treat this as a targeted remediation item for legacy VMware estates. It is not KEV-listed in the bundle, but unpatched management-plane XSS can still create meaningful risk where administrators use affected Host Clients. Mitigation focus: Upgrade ESXi 6.5 to ESXi650-201712103-SG or later.; Upgrade ESXi 6.0 to ESXi600-201711103-SG or later.; Upgrade ESXi 5.5 to ESXi550-201709102-SG or later..

Prepared: Jun 12, 2026, 19:33 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 20, 2017, 15:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.vmware.com/security/advisories/VMSA-2017-0021.htmlCVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

VMwareESXi6.5 before ESXi650-201712103-SG, 6.0 before ESXi600-201711103-SG, 5.5 before ESXi550-201709102-SG)Listed

Weakness

CWE details

No CWE listed

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