CVE-2021-21973

5.3 MEDIUM 88% exploit odds exploited in the wild Fix listed Disclosure Web app

What it is

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).

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
In the wild: CISA lists this as exploited in real attacks. Treat as urgent.
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2021-01-04 00:00 UTC ReservedThe CVE id was reserved by its CNA
2021-02-24 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2022-03-07 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
2022-03-21 Remediation deadlineCISA's due date for federal agencies to fix it
2026-06-17 03:36 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
Exploit odds: 88.0% in the next 30 days (EPSS).
Severity: 5.3 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2021-02-24 17:15 UTC
Last modified: 2026-06-17 03:36 UTC
Added to CISA KEV: 2022-03-07
Exploit probability: 88.0% · EPSS, next 30 days
Weakness: CWE-918 · Server-side request forgery
Record status: Analyzed

Affected

VMware Cloud Foundation < 3.10.1.2
VMware Cloud Foundation < 4.2
VMware Vcenter Server 6.5
VMware Vcenter Server 6.7
VMware Vcenter Server 7.0

Attack profile CVSS 3.1 · 5.3

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-21973.md and follow it. Check whether this project is affected by CVE-2021-21973. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record