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THE THREATOn July 21st, 2025, Cisco confirmed attempted exploitation of recently disclosed maximum severity vulnerabilities impacting its Identity Services Engine (ISE) and ISE Passive…
Jul 21, 2025THE THREAT On July 18th, 2025, CrushFTP confirmed exploitation of a critical zero-day vulnerability, CVE-2025-54309. CVE-2025-54309 (CVSS: 9.0) occurs due to mishandling of…
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THE THREAT
On February 23rd, 2021, VMware disclosed a critical vulnerability impacting vCenter Servers. The vulnerability, tracked as CVE-2021-21972, allows for remote code execution and if exploited, could result in the full compromise of affected systems. Abuse of this vulnerability does not require authentication or user interaction.
Exploitation of CVE-2021-21972 has not been identified in the wild at this time. Due to the ease of exploitation and high severity (9.8/10), it is likely that threat actors will abuse this vulnerability in the near future. Organizations are recommended to apply the official VMware patch as soon as possible.
What we’re doing about it
What you should do about it
Additional information
CVE-2021-21972 is due to issues found in the vSphere Client (HTML5) in vCenter Server plugin. Confirmed impacted vCenter Servers include versions 6.5, 6.7, and 7.
Proof-of-Concept (POC) code and technical details for CVE-2021-21972 were released on February 24th. This release will decrease the amount of time before exploitation occurs in the wild.
In an attack scenario, a threat actor with network access to port 443 could exploit this issue. The threat actor would then be able to execute commands on the vulnerable system with unrested privileges. No previous authentication or privileges are required.
In the same release, VMware announced patches for two other vulnerabilities:
References:
[1] https://www.vmware.com/security/advisories/VMSA-2021-0002.html