CVE-2021-21974

8.8HIGH

Key Information:

Vendor
Vmware
Status
Vmware Esxi
Vmware Cloud Foundation
Vendor
CVE Published:
24 February 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 90%

Summary

OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

Affected Version(s)

VMware Cloud Foundation 4.x before 4.2 and 3.x

VMware ESXi 7.0 before ESXi70U1c-17325551

VMware ESXi 6.7 before ESXi670-202102401-SG

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-21974
Created by Shadow0ps

ESXi-Ransomware-Scanner-mi
Created by CYBERTHREATANALYSIS

Feb2023-CVE-2021-21974-OSINT
Created by n2x4

References

https://www.vmware.com/security/advisories/VMSA-2021-0002...
x_refsource_CONFIRM
https://www.zerodayinitiative.com/advisories/ZDI-21-250/
x_refsource_MISC
http://packetstormsecurity.com/files/162957/VMware-ESXi-O...
x_refsource_MISC

EPSS Score

90% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.