Heap-based buffer overflow in VMware ESXi - CVE-2021-21974
Published: February 24, 2021 / Updated: February 6, 2023
Vulnerability identifier: #VU50900
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2021-21974
CWE-ID: CWE-122
Exploitation vector: Adjecent network
Exploit availability:
The vulnerability is being exploited in the wild
Vendor: VMware, Inc
Affected software:
VMware ESXi
VMware ESXi
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error when processing packets within the OpenSLP service. A remote non-authenticated attacker on the local network can send specially crafted SLP messages to port 427/tcp, trigger a heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note, the vulnerability is being actively exploited in the wild.
How to mitigate CVE-2021-21974
Install updates from vendor's website.