Vulnerability Details : CVE-2021-21991
The vCenter Server contains a local privilege escalation vulnerability due to the way it handles session tokens. A malicious actor with non-administrative user access on vCenter Server host may exploit this issue to escalate privileges to Administrator on the vSphere Client (HTML5) or vCenter Server vSphere Web Client (FLEX/Flash).
Vulnerability category: Gain privilege
Products affected by CVE-2021-21991
- cpe:2.3:a:vmware:vcenter_server:6.5:e:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:c:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:f:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:*:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:-:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:-:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:-:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:c:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update1:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update1b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update1c:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update1d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update1e:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update1g:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update2:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update2b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update2c:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update2d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update2g:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update3:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update3d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update3f:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update3k:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update3n:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update1:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update1b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update2:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update2a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update2c:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3b:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3f:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3g:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3j:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3l:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3m:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update1:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update1a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update1c:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update1d:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update2:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update2a:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.5:update3p:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:6.7:update3n:*:*:*:*:*:*
- cpe:2.3:a:vmware:vcenter_server:7.0:update2b:*:*:*:*:*:*
- cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*
- cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-21991
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-21991
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
References for CVE-2021-21991
-
https://www.vmware.com/security/advisories/VMSA-2021-0020.html
VMSA-2021-0020Patch;Vendor Advisory
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