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.

CrowdSec network observations suggest that most exploitation of CVE-2021-40655 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental. In addition, according to the CrowdSec network, attack volume against CVE-2021-40655 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

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