Stack-based buffer overflow in Internet Download Manager (IDM) before 5.19 allows remote attackers to execute arbitrary code via a crafted FTP URI that causes unspecified "test sequences" to be sent from client to server.

Tonec Internet Download Manager 6.42.41.1 and earlier suffers from Missing SSL Certificate Validation, which allows attackers to bypass update protections.

Internet Download Manager 6.38.12 contains a buffer overflow vulnerability in the Scheduler component that allows local attackers to crash the application by supplying oversized input. Attackers can paste malicious data exceeding 5000 bytes into the 'Open the following file when done' field to trigger a denial of service condition.