An out-of-bounds read vulnerability [CWE-125] in FortiOS SSLVPN web portal versions 7.4.0 through 7.4.4, versions 7.2.0 through 7.2.8, 7.0 all verisons, and 6.4 all versions may allow an authenticated attacker to perform a denial of service on the SSLVPN web portal via a specially crafted URL.
https://www.cisa.gov/news-events/ics-advisories/icsa-25-044-06