Cisco ASA VPN Flaw CVE-2026-76418: Is Your Firewall in Scope?

Cisco ASA and FTD VPN flaw CVE-2026-76418

Cisco has confirmed attacks on a new flaw in its Secure Firewall ASA and FTD software. Tracked as CVE-2026-76418 and rated 8.6 (High), it lets someone with no login make the firewall reload by sending a crafted request to the remote access SSL VPN service. The good news is that not every Cisco firewall is in scope. The bad news is that the ones that are can be knocked offline again and again.

Your firewall is exposed only if all three are true

  • It runs a vulnerable ASA or FTD release
  • Remote access SSL VPN (webvpn) is enabled on at least one interface
  • A tunnel group, including DefaultWEBVPNGroup, uses secondary authentication

One catch: turning off the tunnel group list does not help if DefaultWEBVPNGroup itself uses secondary authentication.

What to do this week

  • List every ASA and FTD device with its model, version and VPN setting
  • Back up the configuration, then move each exposed device to the first fixed release for its train
  • If you cannot patch yet, apply Cisco's workaround and warn users about sign-in changes
  • Check uptime and logs for unexpected reloads and send firewall logs to your SOC

Because CERT-In requires some incidents to be reported within 6 hours, write down any reload times you find.

Read the full guide with the fixed version table here: Cisco Firewall VPN Zero-Day: What Indian Firms Must Do

Published by Affix Center, a Mumbai-based IT services company offering cybersecurity and network security services.

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