Vulnerability · Published Feb 24, 2021 · Assigned by vmware

CVE-2021-21974

High 8.8

In plain English

A high-severity out-of-bounds write in VMware Cloud Foundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 45.1% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)45.1%top 1.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

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 products (as reported)

Vendor	Product	Versions
n/a	VMware ESXi	7.0 before ESXi70U1c-173255516.7 before ESXi670-202102401-SG6.5 before ESXi650-202102101-SG
n/a	VMware Cloud Foundation	4.x before 4.2 and 3.x

Weakness: CWE-787 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

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