Affects widely deployed Cisco Secure Firewall (ASA/FTD); unauthenticated remote DoS against perimeter firewalls can disrupt enterprise networks.
CVE-2026-76418
Remote SSL VPN flaw in Cisco ASA/FTD allows unauthenticated DoS via crafted auth request.
Is CVE-2026-76418 being exploited?
Not confirmed. CVE-2026-76418 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-76418?
CVE-2026-76418 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-76418?
Not known from our data. No patch reference has been recorded for CVE-2026-76418, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-76418 affect?
CVE-2026-76418 affects Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76418?
Apply vendor fixes when published; restrict SSL VPN access and disable secondary auth if feasible; monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can send a crafted SSL VPN request that causes ASA/FTD to reload, resulting in denial of service.
Immediate action required
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As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.