Zero-Day Advisory

Fortinet Discovers AVG Self-protection Bypass by disabling AV update


When performing AV's update, AVG is reading some legacy registry entry that could lead to AVG file path hijacking, which could in turn allows adversaries to disable AV auto-update


AVG's users should apply latest updates from the vendor

Additional Information

Following products and versions are affected.

AVG Free Edition 16.101.7752 and below


This vulnerability was discovered by Wayne Low of Fortinet's FortiGuard Labs.

IPS Subscription

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be protected against this vulnerability with the appropriate configuration parameters in place. Fortinet's IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by FortiGuard Labs, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.