CVE-2017-4940

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.

Published: 2017-12-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-4940 is rated Moderate Risk (44.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.91%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-4940

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.15% 0.91% +0.76%
2 2026-05-16 0.23% 0.15% -0.08%
3 2025-03-30 — 0.23% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-4940

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2017-4940

Affected software / configurations for CVE-2017-4940

Vendor Product Version Raw CPE
vmware esxi 5.5 cpe:2.3:o:vmware:esxi:5.5:-:*:*:*:*:*:*
vmware esxi 5.5 cpe:2.3:o:vmware:esxi:5.5:1:*:*:*:*:*:*
vmware esxi 5.5 cpe:2.3:o:vmware:esxi:5.5:2:*:*:*:*:*:*
vmware esxi 5.5 cpe:2.3:o:vmware:esxi:5.5:3a:*:*:*:*:*:*
vmware esxi 5.5 cpe:2.3:o:vmware:esxi:5.5:3b:*:*:*:*:*:*
vmware esxi 5.5 cpe:2.3:o:vmware:esxi:5.5:550-20170901001s:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:-:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:1:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:1a:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:1b:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:2:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:3:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:3a:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201504401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201505401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507101:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507102:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507402:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507403:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507404:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507405:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507406:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201507407:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509101:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509102:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509201:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509202:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509203:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509204:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509205:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509206:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509207:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509208:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509209:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201509210:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201510401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201511401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601101:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601102:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601402:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601403:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601404:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201601405:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201602401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603101:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603102:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603201:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603202:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603203:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603204:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603205:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603206:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603207:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201603208:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201605401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201608101:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201608401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201608402:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201608403:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201608404:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201608405:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201610410:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201611401:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201611402:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201611403:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702101:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702102:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702201:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702202:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702203:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702204:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702205:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702206:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702207:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702208:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702209:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702210:*:*:*:*:*:*
vmware esxi 6.0 cpe:2.3:o:vmware:esxi:6.0:600-201702211:*:*:*:*:*:*

References for CVE-2017-4940

cvelogic Threat Intelligence