Heap-based buffer overflow in VMware ESXi - CVE-2021-21974

Vulnerability details

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.

Affected software

How to mitigate CVE-2021-21974

Links to Public Exploits and PoC-codes

• Exploit #6531 - CVE-2021-21974 (POC for CVE-2021-21974 VMWare ESXi RCE Exploit) (July 10, 2021)

External References

• https://www.vmware.com/security/advisories/VMSA-2021-0002.html
• https://kb.vmware.com/s/article/76372
• https://www.zerodayinitiative.com/advisories/ZDI-21-250/

Related Security Bulletins

• Remote code executioin in OpenSLP service in VMware ESXi
• Multiple vulnerabilities in Dell Enterprise Hybrid Cloud
• Multiple vulnerabilities in Dell PowerFlex Appliance
• Multiple vulnerabilities in Dell PowerFlex rack
• Multiple vulnetabilities in Dell EMC Integrated Data Protection Appliance