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CVE-2026-19318 is a pre-authentication stack-based buffer overflow in the iked IKE/VPN daemon of WatchGuard Fireware OS. Processing a malformed EAP-MSCHAPv2 payload can overwrite stack memory. A remote, unauthenticated attacker can trigger the flaw through specially crafted traffic sent to the exposed VPN service, potentially resulting in arbitrary code execution or a daemon crash.
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No public exploit code observed for this vulnerability.
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Critical pre-authentication stack buffer overflow in WatchGuard Fireware OS iked VPN service, reachable through malformed EAP-MSCHAPv2 traffic, that permits remote code execution.
A remotely exploitable, unauthenticated stack-based buffer overflow in the WatchGuard Fireware OS iked process that permits arbitrary code execution through specially crafted network traffic.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.