CVE-2020-3952

CRITICAL9.8

CISA KEV

Published 2020-04-10 · Updated 2026-06-17 · Source security@vmware.com

Summary

CVE-2020-3952 is a critical-severity (CVSS 9.8) vulnerability in VMware vCenter Server. CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 3, 2022. CISA does not currently list it as used in ransomware campaigns. VMware has 26 vulnerabilities in the KEV catalog, 9 of them linked to ransomware.

All 26 known-exploited VMware vulnerabilities →

Description

Under certain conditions, vmdir that ships with VMware vCenter Server, as part of an embedded or external Platform Services Controller (PSC), does not correctly implement access controls.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-306CWE-306

CISA Known-Exploited Vulnerability

Product: VMware — vCenter Server

Name: VMware vCenter Server Information Disclosure Vulnerability

Date added: 2021-11-03 · Due: 2022-05-03

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited VMware vulnerabilities

Most recently added to CISA KEV

CVE-2025-22226
ESXi, Workstation, and Fusion — VMware ESXi, Workstation, and Fusion Information Disclosure Vulnerability
added 2025-03-04
CVE-2025-22225
RANSOMWARE
ESXi — VMware ESXi Arbitrary Write Vulnerability
added 2025-03-04
CVE-2025-22224
ESXi and Workstation — VMware ESXi and Workstation TOCTOU Race Condition Vulnerability
added 2025-03-04
CVE-2024-38813
vCenter Server — VMware vCenter Server Privilege Escalation Vulnerability
added 2024-11-20
CVE-2024-38812
vCenter Server — VMware vCenter Server Heap-Based Buffer Overflow Vulnerability
added 2024-11-20
CVE-2024-37085
RANSOMWARE
ESXi — VMware ESXi Authentication Bypass Vulnerability
added 2024-07-30

View all →

Related CVEs

Same severity, most recent

CVE-2026-109469
Authorization bypass through user-controlled key in Entra Device Registration allows an unauthorized attacker to elevate privileges over a network.
2026-11-06 · score 10.0
CVE-2026-68935
Chartbrew is an open-source web application for creating charts from databases and APIs. In versions 4.8.5 through 5.2.2, API connection creation and update operations accept the internal allowPrivateHost field from user input. An authenticated user with permission to manage API connections can enable this field to bypass private and reserved-network destination restrictions. An upgrade migration also enables the override on pre-existing API connections. The per-connection setting takes precedence over CB_ALLOW_PRIVATE_NETWORK_CALLS , so disabling that instance option does not protect connections with the override enabled. Successful exploitation allows requests to internal HTTP services reachable from the Chartbrew server, potentially disclosing information or triggering unauthorized actions depending on the target service. Recognized cloud metadata endpoints remain separately blocked. This issue is fixed in version 5.2.3.
2026-11-06 · score 9.1
CVE-2026-59104
UgCS server before 6.2 contains an authentication bypass in the HCI protocol login handler (LoginHandler) exposed on TCP port 3334. When the user database contains exactly one user (the default single-operator installation), a LoginRequest with empty userLogin and userPassword fields is interpreted as \"use the only user\" rather than as invalid credentials, and the server returns a fully authenticated session. Because the service listens on all interfaces (0.0.0.0) without TLS by default, an unauthenticated remote attacker with network access to port 3334 can obtain an authenticated session without knowing any credential and then issue privileged commands, including commanding connected drones and uploading flight routes.
2026-11-06 · score 9.8
CVE-2026-86044
JupyterLab Desktop is the cross-platform desktop application for JupyterLab. Prior to 4.6.2-1, JupyterLab Desktop exposed getServerInfo to the renderer without confirming that the current page still had the local Jupyter server origin. In a local managed session using JupyterLab before 4.4.8, an attacker can place a crafted MathJax link in an untrusted notebook. If a victim opens the notebook and clicks the link, the existing renderer navigates to an attacker-controlled site while retaining access to the preload bridge. The site can call getServerInfo to obtain the local server URL and authentication token, then use the Jupyter REST API to create and trust a notebook that executes arbitrary code as the victim. Users whose environment already uses JupyterLab 4.4.8 or later are unaffected because the corrected link handling breaks the first step of the chain. This vulnerability is fixed in 4.6.2-1.
2026-11-06 · score 9.6
CVE-2026-85295
Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to 5.2.3, four authentication helpers accepted session tokens signed with CB_SECRET, including known, weak, or shipped-default values. The vulnerable surface is session JWT fallback in server/modules/verifyToken.js, verifyUser.js, getUserFromToken.js, and socketManager.js across the API and socket layer. A stock source or repository Docker Compose deployment retains a known, weak, or default CB_SECRET and an attacker submits a forged HS256 token decoding to a target user id. Knowing the symmetric secret lets the attacker create a token that the legacy verification fallback accepts as the target user without that user's password or two-factor authentication. The condition includes stock source and repository Docker Compose installs and any otherwise known or weak CB_SECRET; a bare container where CB_SECRET is undefined is not affected by this fallback path. A forged session impersonates the chosen user across the entire API and socket layer and exercises that user's Chartbrew privileges. This issue is fixed in version 5.2.3.
2026-11-06 · score 9.8