VMware - Information Disclosure (CVE-2021-0027)
Description
The vSphere Web Client (FLEX/Flash) contains an unauthorized arbitrary file read vulnerability. A malicious actor with network access to port 443 on vCenter Server may exploit this issue to gain access to sensitive information.
psychologyCrowdSec Analysis
CVE-2021-0027 is an Information Disclosure vulnerability affecting VMware vCenter Server. Unauthenticated attackers can exploit this vulnerability to read arbitrary files on the vCenter Server.
CrowdSec has been tracking this vulnerability and its exploits since 9th of December 2021.
CrowdSec network data shows that most actors exploiting CVE-2021-0027 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. In addition, according to the CrowdSec network, attack volume against CVE-2021-0027 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.
There are no public exploits for this vulnerability. However, it is usually abused by sending crafted requests to the vCenter Server.
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| Event | Date |
|---|---|
| CVE Published | 2021-11-24 |
| Rule Released | 2021-12-09 |
| CrowdSec First Seen | 2025-09-19 |