Antivirus programs accounted for most of the affected products the security company identified, but one vulnerability also exists in a commercial hooking engine developed by Microsoft and used by over 100 other software vendors.

EnSilo identified affected products from AVG, Kaspersky Lab, McAfee/Intel Security, Symantec, Trend Micro, Bitdefender, Citrix, Webroot, Avast, Emsisoft and Vera Security.

Some of these vendors have released fixes for the flaws, but patching is not easy because it often requires recompiling each affected product individually. Microsoft plans to release patches for its Microsoft Detours hooking engine in August, enSilo said.

Bitdefender said it fixed the problem on Jan. 19, and has pushed the fix out to affected customers. Microsoft and Symantec did not immediately respond to a request for comment.