Check Point Advisories

D-Link DIR-816 Stack Overflow (CVE-2021-27114)

Vulnerability
Protection

Check Point Reference:	CPAI-2021-2646
Date Published:	10 Dec 2025
Severity:	Critical
Last Updated:	Wednesday 10 December, 2025
Source:
Industry Reference:	CVE-2021-27114
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	D-Link DIR-816 1.10b05
Vulnerability Description	A stack overflow vulnerability in D-Link DIR-816 allows remote attackers to overwrite the return address by sending a crafted packet to the /goform/addassignment route.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the D-Link DIR-816 Stack Overflow (CVE-2021-27114) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Application Servers Protection Violation.
Attack Information: D-Link DIR-816 Stack Overflow (CVE-2021-27114)