Hackers continue to look for Pulse Secure and Fortinet devices affected by recently disclosed flaws, but Pulse Secure says a majority of its customers are no longer vulnerable and Fortinet has released FortiGuard signatures that should block attacks.

The vulnerabilities were first disclosed in July by Orange Tsai and Meh Chang of the research team at security consulting firm DEVCORE. They found several serious weaknesses in enterprise VPN products from Fortinet, Palo Alto Networks and Pulse Secure, and warned that they could be exploited to infiltrate corporate networks, obtain sensitive information, and eavesdrop on communications.

The researchers also detailed their findings at the Black Hat and DEFCON conferences, and several proof-of-concept (PoC) exploits were made public after their presentations.