[FortiOS] Heap buffer overflow in the processing of Link Control Protocol messages Fortinet PSIRT Advisories Fortinet PSIRT Contact: Website: https://fortiguard.fortinet.com/faq/psirt-contact FG-IR-20-082 Final 1 1 2020-09-24T00:00:00 Current version 2020-09-24T00:00:00 2020-09-24T00:00:00 A heap-based buffer overflow vulnerability in the processing of Link Control Protocol messages in FortiOS may allow a remote attacker with valid SSL VPN credentials to crash the SSL VPN daemon by sending a large LCP packet, when tunnel mode is enabled. Arbitrary code execution may be theoretically possible, albeit practically very difficult to achieve in this context. Execute unauthorized code or commands FortiOS versions 5.6.12 and below.FortiOS versions 6.0.10 and below. FortiOS versions 6.2.4 and below. FortiOS versions 6.4.1 and below. Please upgrade to FortiOS versions 5.6.13 or above. Please upgrade to FortiOS versions 6.0.11 or above. Please upgrade to FortiOS versions 6.2.5 or above. Please upgrade to FortiOS versions 6.4.2 or above.Workaround: Disable tunnel mode. Fortinet is pleased to thank Communications Security Establishment (CSEC) for reporting this vulnerability under responsible disclosure. CVE-2020-12819 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:U/RL:X/RC:X https://fortiguard.fortinet.com/psirt/FG-IR-20-082 [FortiOS] Heap buffer overflow in the processing of Link Control Protocol messages Reference>