CVE-2026-73446

Security Advisory 0160

State: Published
Severity: 7.0 High
Published: Sep 15, 2026
Updated: Sep 16, 2026
Reserved: Aug 12, 2026

Description

On affected platforms running Arista EOS with IS-IS configured on a broadcast interface, an unauthenticated attacker can send a crafted IS-IS Hello Protocol Data Unit (PDU) that causes the device to tear down an established IS-IS adjacency. This may result in traffic disruption and loss of IP reachability for prefixes advertised through that adjacency.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H	Arista
3.1	7.4 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	Arista

Weaknesses

CWE-696 Incorrect Behavior Order

Affected Products

Product	Versions
EOSArista Networks	4.36.0 through 4.36.1FAffected 4.35.0 through 4.35.5MAffected 4.34.0 through 4.34.7.1MAffected 4.33.0 through 4.33.9MAffected 4.32.0 to before 4.33.0FAffected 4.31.0 to before 4.32.0FAffected

References

Security Advisory 0160vendor-advisory

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