CVE-2026-126254 · Infrastructure
NO FIX YET · SEE WHAT TO DO
FortiOS, Fortinet's firewall and router operating system, mishandles numeric values in BGP attributes. A configured iBGP neighbor can send specially crafted malformed attributes that reach every router connected to it.
first public Nov 11, 2026 · 1 source
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Only FortiOS devices that run BGP with an iBGP neighbor are exposed, and the attacker must already be a configured neighbor. Affected ranges are FortiOS 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.12 and 7.2.0 through 7.2.13. Networks without BGP, or without iBGP peers, can skip it.
Not affected if fortios-outside-listed-ranges, no-bgp, no-ibgp-neighbors
Who cares bgp, firewalls, fortinet, fortios, routers
get system statusget router info bgp summary and list the iBGP neighborsA numeric truncation error vulnerability in Fortinet FortiOS 8.0.0 through 8.0.1, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13 may allow a configured ibgp neighbor to send malicious/malformed attributes to all connected routers via a specially crafted request
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