Server-Side Request Forgery (SSRF) in vCenter Server and Cloud Foundation - CVE-2021-21973

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Main Vulnerability Database Vulnerabilities #VU50899

Server-Side Request Forgery (SSRF) in vCenter Server and Cloud Foundation - CVE-2021-21973

Published: February 24, 2021 / Updated: March 8, 2022


Vulnerability identifier: #VU50899
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N]
CVE-ID: CVE-2021-21973
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability: The vulnerability is being exploited in the wild

Vulnerability details

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in vSphere Client. A remote non-authenticated attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.


Affected software

vCenter Server
Dell Enterprise Hybrid Cloud
Cloud Foundation
PowerFlex Appliance
PowerFlex rack
Dell EMC VxRail Appliance

How to mitigate CVE-2021-21973

Install updates from vendor's website.

vCenter Server - addressed in versions 6.5 U3n, 6.7 U3l, 7.0 U1c
Cloud Foundation - addressed in versions 3.10.1.2, 4.2
PowerFlex Appliance - addressed in versions Intelligent_Catalog_36_360_02_r1, Intelligent_Catalog_36_354_02_r4
PowerFlex rack - addressed in versions 3.3.9.2, 3.4.4.2, 3.5.4.2
Dell Enterprise Hybrid Cloud - update to 4.1.2
Dell EMC VxRail Appliance - addressed in versions 4.5.452, 4.7.525, 7.0.101

Links to Public Exploits and PoC-codes

External References

Related Security Bulletins