CVE-2026-73446
7.4
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Arista Networks | EOS | 4.36.0 <= 4.36.1F | affected |
| Arista Networks | EOS | 4.35.0 <= 4.35.5M | affected |
| Arista Networks | EOS | 4.34.0 <= 4.34.7.1M | affected |
| Arista Networks | EOS | 4.33.0 <= 4.33.9M | affected |
| Arista Networks | EOS | 4.32.0 < 4.33.0F | affected |
| Arista Networks | EOS | 4.31.0 < 4.32.0F | affected |
Weaknesses
- CWE-696: CWE-696: Incorrect Behavior Order
Workarounds
No workaround is available for this issue.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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