D-Link - Information Disclosure (CVE-2021-40655)

CVE-2021-40655 is a vulnerability affecting certain D-Link products, where information disclosure can occur if a remote attacker forges requests to a specific configuration page.

CrowdSec has been tracking this vulnerability and its exploits since 10th of March 2025.

According to CrowdSec data, while opportunistic exploitation dominates, a portion of threat actors trying to exploit CVE-2021-40655 apply basic targeting methods such as port or service detection. This indicates emerging patterns of selective targeting. CrowdSec network telemetry also shows that exploitation of CVE-2021-40655 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers typically attempt to exploit this issue by making requests to endpoints ending with /getcfg.php.