Feds say hackers are likely exploiting critical Fortinet VPN vulnerabilities

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The FBI and the Cybersecurity and Infrastructure Security Agency said that advanced hackers are likely exploiting critical vulnerabilities in the Fortinet FortiOS VPN in an attempt to plant a beachhead to breach medium and large-sized businesses in later attacks.

“APT actors may use these vulnerabilities or other common exploitation techniques to gain initial access to multiple government, commercial, and technology services,” the agencies said Friday in a joint advisory. “Gaining initial access pre-positions the APT actors to conduct future attacks.” APT is short for advanced persistent threat, a term used to describe well-organized and well-funded hacking groups, many backed by nation states.

Breaching the mote

Fortinet FortiOS SSL VPNs are used mainly in border firewalls, which cordon off sensitive internal networks from the public Internet. Two of the three already-patched vulnerabilities listed in the advisory—CVE-2018-13379 and CVE-2020-12812—are particularly severe because they make it possible for unauthenticated hackers to steal credentials and connect to VPNs that have yet to be updated.

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