CVE-2026-121294 · Vendor
NO FIX YET
On Arista EOS devices with an S-BFD reflector proxy configured, a crafted S-BFD packet can make the device temporarily stop reflecting S-BFD packets. The result is S-BFD session timeouts, a disruption of link-liveness checks rather than code execution.
first public Nov 10, 2026 · 1 source
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Only Arista EOS devices with an S-BFD reflector proxy configured are exposed, according to the sources. Operators running EOS routers or switches without that feature enabled can skip it. The sources do not list affected versions.
Not affected if default-config, no-sbfd-reflector-proxy
Who cares arista-eos, network-devices, s-bfd
No fix yet, per the sources.
On affected platforms running Arista EOS with a S-BFD reflector proxy configured, an unauthenticated attacker could send a crafted S-BFD Protocol Data Unit (PDU) that might cause the device to temporarily cease reflecting S-BFD packets, potentially resulting in S-BFD session timeouts.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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