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CVE-2026-19313 is a pre-authentication heap-based buffer overflow in the WatchGuard Fireware OS IKE daemon (iked). An unauthenticated remote attacker can send specially crafted VPN/IKE network traffic to trigger the overflow, crash the daemon, and potentially execute arbitrary code. The published CVSS v4 vector indicates network attackability, low complexity, no privileges, no user interaction, and high confidentiality, integrity, and availability impact on the vulnerable system.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Critical pre-authentication heap buffer overflow in WatchGuard Fireware OS iked VPN service that permits remote code execution.
A critical-severity remote, unauthenticated heap-overflow vulnerability in the WatchGuard Fireware OS iked process that can allow 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.