What is the CVSS score of CVE-2020-3994?

CVE-2020-3994 has a CVSS 3.1 base score of 7.4 (High). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.6%.

Is there a patch available for CVE-2020-3994?

Yes, a patch is available for CVE-2020-3994. Update the affected software to the latest version immediately.

Vcenter Server CVE-2020-3994

HIGH

Improper Certificate Validation (CWE-295)

2020-10-20 security@vmware.com

Information Disclosure VMware Cloud Foundation Vcenter Server

7.4

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-295 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V12 - Secure Communication Certificate validation
Impact	CVSS score of 7.4 (HIGH). Attack characteristics: network attack vector, high complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.6% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-295. VMware vCenter Server (6.7 before 6.7u3, 6.6 before 6.5u3k) contains a session hijack vulnerability in the vCenter Server Appliance Management Interface update function due to a lack of certificate validation. A malicious actor with network positioning between vCenter Server and an update repository may be able to perform a session hijack when the vCenter Server Appliance Management Interface is used to download vCenter updates. Affected products include: Vmware Cloud Foundation, Vmware Vcenter Server. Version information: before 6.7.

Know when Vcenter Server gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 7.4 HIGH

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

DescriptionNVD

VMware vCenter Server (6.7 before 6.7u3, 6.6 before 6.5u3k) contains a session hijack vulnerability in the vCenter Server Appliance Management Interface update function due to a lack of certificate validation. A malicious actor with network positioning between vCenter Server and an update repository may be able to perform a session hijack when the vCenter Server Appliance Management Interface is used to download vCenter updates.

Threat Intelligence Overview

EPSS Score

0.6%

Top 54% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.6%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +37

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:-:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:a:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:b:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:c:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:d:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:e:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:f:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update1:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update1b:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update1c:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update1d:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update1e:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update1g:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update2:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update2b:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update2c:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update2d:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update2g:*:*:*:*:*:*

cpe:2.3:a:vmware:vcenter_server:6.5:update3:*:*:*:*:*:*

+ 10 more

More in Vcenter Server

View all

CVE-2021-21985 CRITICAL Emergency POC

9.8 May 26

The vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual

CVE-2021-21972 CRITICAL Emergency POC

9.8 Feb 24

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. Rated critical sev

CVE-2015-2342 CRITICAL Act Now POC

10.0 Oct 12

The JMX RMI service in VMware vCenter Server 5.0 before u3e, 5.1 before u3b, 5.5 before u3, and 6.0 before u1 does not r

CVE-2021-22005 CRITICAL Act Now POC

9.8 Sep 23

The vCenter Server contains an arbitrary file upload vulnerability in the Analytics service. Rated critical severity (CV

CVE-2024-37081 HIGH Act Now POC

7.8 Jun 18

The vCenter Server contains multiple local privilege escalation vulnerabilities due to misconfiguration of sudo. Rated h

CVE-2021-22015 HIGH Act Now POC

7.8 Sep 23

The vCenter Server contains multiple local privilege escalation vulnerabilities due to improper permissions of files and

CVE-2020-3952 CRITICAL Act Now POC

9.8 Apr 10

Under certain conditions, vmdir that ships with VMware vCenter Server, as part of an embedded or external Platform Servi

CVE-2022-31680 CRITICAL Act Now POC

9.1 Oct 07

The vCenter Server contains an unsafe deserialisation vulnerability in the PSC (Platform services controller). Rated cri

CVE-2013-1405 CRITICAL Act Now

10.0 Feb 15

VMware vCenter Server 4.0 before Update 4b and 4.1 before Update 3a, VMware VirtualCenter 2.5, VMware vSphere Client 4.0

CVE-2016-2078 MEDIUM This Month POC

6.1 Jun 08

Cross-site scripting (XSS) vulnerability in the Web Client in VMware vCenter Server 5.1 before update 3d, 5.5 before upd

CVE-2017-4923 CRITICAL Act Now

9.8 Aug 01

VMware vCenter Server (6.5 prior to 6.5 U1) contains an information disclosure vulnerability. Rated critical severity (C

CVE-2024-38813 CRITICAL Act Now

9.8 Sep 17

The vCenter Server contains a privilege escalation vulnerability. Rated critical severity (CVSS 9.8), this vulnerability

Same weakness CWE-295 – Improper Certificate Validation

View all

CVE-2026-85102 CRITICAL POC

9.8

CVE-2015-3152 MEDIUM POC

5.9

CVE-2017-2800 CRITICAL POC

9.8

CVE-2014-1266 HIGH POC

7.4

CVE-2022-47758 CRITICAL POC

9.8

CVE-2025-68121 CRITICAL POC

10.0

CVE-2025-29331 CRITICAL POC

9.8

CVE-2025-32878 CRITICAL POC

9.8

Same technique Information Disclosure

View all

CVE-2019-2725 CRITICAL POC

9.8

CVE-2021-34523 CRITICAL POC

9.0

CVE-2013-2251 CRITICAL POC

9.8

CVE-2017-5638 CRITICAL POC

9.8

CVE-2025-24813 CRITICAL POC

9.8

CVE-2025-68613 HIGH POC

8.8

CVE-2015-1701 HIGH POC

7.8

CVE-2017-0147 HIGH POC

7.5

References

Advisories & patches

PATCH https://www.vmware.com/security/advisories/VMSA-2020-0023.html

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back