CVE-2021-21980
The vSphere Web Client (FLEX/Flash) contains an unauthorized arbitrary file read vulnerability. A...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-21980- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:P/I:N/A:N - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2021-21980- Updated
- 2026-11-02
EUVDEUVD-2021-9151 No score
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.
- Record
EUVD-2021-9151- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-j86w-wm9c-rcfm
The vSphere Web Client (FLEX/Flash) contains an unauthorized arbitrary file read vulnerability. A...
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.
- Record
GHSA-j86w-wm9c-rcfm- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | Osyanina/westone-CVE-2021-21980-scanner | 2021-12-03 |
| PoC in GitHub | Osyanina/westone-CVE-2022-1388-scanner | 2022-05-07 |
| PoC in GitHub | gui2000guix-ui/cve-2021-21980-mock-server | 2025-11-27 |
| PoC in GitHub | gui2000guix-ui/cve-2021-21980-nuclei-poc | 2025-11-27 |
| PoC in GitHub | pkxk5pr6m2-web/cve-2021-21980-nuclei-poc | 2025-11-27 |
| PoC in GitHub | pratikjojode/vcenter-cve-2021-21980-lab | 2025-12-01 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-21980 is a high vulnerability (CVSS 7.5) in Vmware Vcenter Server, published November 24, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 4.67%, the 91st percentile. No source names a fixed version.