What’s Vulnerable › Vulnerabilities
CVE-2026-73446: Security Advisory 0160
- Severity: high (CVSS 7.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-16 · updated 2026-09-16
- Weakness: CWE-696
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.
Affected products
- Arista Networks EOS: from 4.36.0 through 4.36.1F; from 4.35.0 through 4.35.5M; from 4.34.0 through 4.34.7.1M; from 4.33.0 through 4.33.9M; from 4.32.0 before 4.33.0F; from 4.31.0 before 4.32.0F — fixed in 4.32.0F, 4.33.0F
How to fix
Upgrade to a fixed version: Arista Networks EOS 4.32.0F, 4.33.0F. Check the vendor advisory for mitigations.
References
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