CVE-2021-21973

CVE Published	2021-02-24
Related CWE(s)	CWE-918: Server-Side Request Forgery (SSRF)
Related Vendor(s)	vmware
Related Product(s)	cloud_foundation, vcenter_server
Exploitation Reported (CISA KEV)	2022-03-07
CVSS 3 Base Score	5.3 (MEDIUM)
CVSS 3 Attack Complexity	LOW
CVSS 3 Attack Vector	NETWORK

The vSphere Client (HTML5) contains an SSRF (Server Side Request Forgery) vulnerability due to improper validation of URLs in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue by sending a POST request to vCenter Server plugin leading to information disclosure. This affects: VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2).

Cyber Threat Graph Context

Explore how this CVE relates to the wider threat graph

Associated CAPEC Patterns

Server Side Request Forgery (CAPEC-664)

An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

References

CVE-2021-21973

Cyber Threat Graph Context

Associated CAPEC Patterns

Server Side Request Forgery (CAPEC-664)

References

CVE.org

NIST National Vulnerability Database

CISA Known Exploited Vulnerabilities