CVE-2020-3959

VMware ESXi (6.7 before ESXi670-202004101-SG and 6.5 before ESXi650-202005401-SG), VMware Workstation (15.x before 15.1.0) and VMware Fusion (11.x before 11.1.0) contain a memory leak vulnerability in the VMCI module. A malicious actor with local non-administrative access to a virtual machine may be able to crash the virtual machine's vmx process leading to a partial denial of service.

Published: 2020-05-29 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-3959 is rated Low Risk (20.7/100): CVSS Low severity, with low exploitation likelihood (EPSS 0.29%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2020-3959

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 0.10% 0.29% +0.20%
2 2025-11-21 0.04% 0.10% +0.05%
3 2025-11-18 — 0.04% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-3959

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.3 3.1 LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 1.8 1.4 [email protected]
2.1 2.0 LOW
AV:L/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 3.9 2.9 [email protected]

Weakness enumeration for CVE-2020-3959

Affected software / configurations for CVE-2020-3959

Vendor Product Version Raw CPE
vmware fusion >= 11.0.0, < 11.1.0 cpe:2.3:a:vmware:fusion:*:*:*:*:*:*:*:*
vmware workstation >= 15.0.0, < 15.1.0 cpe:2.3:a:vmware:workstation:*:*:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:-:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201701001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201703001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201703002:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201704001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707101:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707102:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707103:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707201:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707202:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707203:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707204:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707205:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707206:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707207:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707208:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707209:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707210:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707211:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707212:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707213:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707214:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707215:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707216:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707217:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707218:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707219:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707220:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201707221:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201710001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201712001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201803001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201806001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201808001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201810001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201810002:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201811001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201811002:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201811301:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201901001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201903001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201905001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201908001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201910001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-20191004001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201911001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201911401:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201911402:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912001:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912002:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912101:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912102:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912103:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912104:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912301:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912401:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912402:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912403:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-201912404:*:*:*:*:*:*
vmware esxi 6.5 cpe:2.3:o:vmware:esxi:6.5:650-202005001:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:-:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201806001:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201807001:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201808001:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810001:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810101:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810102:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810103:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810201:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810202:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810203:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810204:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810205:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810206:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810207:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810208:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810209:*:*:*:*:*:*
vmware esxi 6.7 cpe:2.3:o:vmware:esxi:6.7:670-201810210:*:*:*:*:*:*

References for CVE-2020-3959

cvelogic Threat Intelligence