Core manufacturers

Fortinet, Zyxel, and a stronger Cisco Secure Firewall lane

This page is grounded in the current research notes and official-source dataset, then organized into a cleaner public landing page. Fortinet still leads on urgency, Zyxel still contributes clean firewall patch targets, and Cisco Secure Firewall now has two operator-grade records after an August 2026 actively exploited SSL VPN DoS advisory joined the earlier persistence-response entry.

VendorUpdateFixed version(s)PublishedSource
Cisco Secure Firewall
ASA / FTD Remote Access SSL VPN
Cisco Secure Firewall ASA/FTD Remote Access SSL VPN DoS update
Cisco disclosed an actively exploited Remote Access SSL VPN flaw that could let an unauthenticated attacker force an affected Secure Firewall ASA or FTD device to reload, with exact fixed ASA releases and FTD hotfix targets across current branches.
ASA 9.16.4.50 / 9.18.4.50 / 9.20.4.235 / 9.22.3.191 / 9.23.1.211 / 9.24.1.221
FTD 7.0.9.1-1 GC
FTD 7.2.11.1-2 HM
FTD 7.4.7.1-1 HK
FTD 7.6.4.1-2 DD
FTD 7.7.11.1-2 AN
2026-08-11Official source ↗
Fortinet
FortiOS Agentless VPN / FSSO
FG-IR-25-1052 LDAP authentication bypass in Agentless VPN and FSSO
Fortinet disclosed an authentication-bypass flaw in FortiOS fnbamd that may let an unauthenticated attacker bypass LDAP authentication for Agentless VPN or FSSO policies under a specific LDAP-server configuration, with one active affected branch, a fixed release, and a practical workaround.
FortiOS 7.6.5+2026-07-04Official source ↗
Zyxel
ZLD firewalls
Zyxel fixes CVE-2026-14818 in ZLD firewalls
Zyxel published a ZLD firewall advisory for a path traversal flaw in the configuration-file execution CLI command that could let an authenticated administrator execute a crafted malicious configuration file, with one clean patched target version across ATP and USG FLEX families.
ATP ZLD V5.43
USG FLEX ZLD V5.43
USG FLEX 50(W) / USG20(W)-VPN ZLD V5.43
2026-08-04Official source ↗
Fortinet
FortiOS CAPWAP daemon
FG-IR-26-123 FortiOS CAPWAP daemon out-of-bounds write update
Fortinet disclosed a high-severity CAPWAP daemon out-of-bounds write that may let an attacker controlling an authenticated FortiAP, FortiExtender, or FortiSwitch gain execution privileges on a FortiGate device, with clear fixed releases and a published workaround.
FortiOS 7.6.4+
FortiOS 7.4.9+
FortiOS 7.2.12+
2026-05-12Official source ↗
Cisco Secure Firewall
ASA / FTD
Cisco Secure Firewall ASA/FTD persistence response after CISA ED 25-03 update
Cisco told operators on affected Secure Firewall ASA and FTD hardware to check for compromise, reimage if needed, and move to listed fixed releases after disclosing a persistence mechanism that can survive earlier September 2025 fixes.
ASA 9.16.4.92 / 9.18.4.135 / 9.20.4.30 / 9.22.3.5 / 9.23.1.195 / 9.24.1.155
FTD 7.0.9 + FZ-7.0.9.1-3
FTD 7.2.11 + HI-7.2.11.1-1
FTD 7.4.7
FTD 7.6.4 + CC-7.6.4.1-1
FTD 7.7.11 + AE-7.7.11.1-4
2026-04-23Official source ↗
Zyxel
USG FLEX H / uOS
Zyxel USG FLEX H privilege escalation security update
Zyxel published a USG FLEX H firewall advisory covering incorrect permission assignment and improper privilege management issues that could let a local attacker escalate privileges; the vendor says patched uOS builds are available.
uOS V1.322025-04-22Official source ↗
Fortinet
FortiOS administrative interface
FG-IR-24-535 authentication bypass using alternate path/channel
Fortinet disclosed an authentication bypass that could allow a remote attacker to gain super-admin privileges via crafted requests to the Node.js websocket module or crafted CSF proxy requests; the vendor said it was being exploited in the wild.
FortiOS 7.0.17+2025-03-31Official source ↗