CVE-2026-73446

Security Advisory 0160

HIGH

7.4

CVSS Score

Published: September 15, 2026 at 11:08 PM UTC

Updated: September 16, 2026 at 08:17 PM UTC

1 product affected across 1 vendorArista EOS

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Severity

HIGH7.4

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Arista EOS · Arista Networks

60%

4.31.0 ≤ v < 4.32.0F4.32.0 ≤ v < 4.33.0F4.33.0 ≤ v ≤ 4.33.9M4.34.0 ≤ v ≤ 4.34.7.1M4.35.0 ≤ v ≤ 4.35.5M4.36.0 ≤ v ≤ 4.36.1F4.31.0 4.32.0 4.33.0 4.34.0 4.35.0 4.36.0

Affected range stops below 4.32.0F, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.33.0F, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160

References (1)

Vendor Advisory

Source: cverecord

https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHArista

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: CHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-696

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