CVE-2026-73446

HighCVSS 7.4/10Last modified Sep 16, 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.

Metrics

CVSS 3.1 7.4/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weakness enumeration

CWE-696

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
Arista NetworksEOS>= 4.36.0, <= 4.36.1F; >= 4.35.0, <= 4.35.5M; >= 4.34.0, <= 4.34.7.1M; >= 4.33.0, <= 4.33.9M; >= 4.32.0, < 4.33.0F; >= 4.31.0, < 4.32.0F

References

Timeline

Published
Sep 16, 2026
Last modified
Sep 16, 2026
NVD status
Awaiting Analysis

Related CVEs from 2026

CVE-2026-734479.1A privileged attacker can exploit certain operation to execute arbitrary commands with root privileges, leading to full device compromise. ACVE-2026-734495.9On affected platforms running Arista EOS with both 802.1X port authentication and the RADIUS proxy feature configured with dynamic authorizaCVE-2026-73458.3Insufficient validation of untrusted input in Feedback in Google Chrome prior to 147.0.7727.138 allowed a remote attacker who had compromiseCVE-2026-734506.9On affected platforms running Arista EOS with MLAG Dual Primary Detection configured, an unauthenticated attacker with access to the Dual PrCVE-2026-734514.8On affected platforms running Arista EOS with dual switch cards and with ingress Security ACLs configured on Switched Virtual Interfaces (SVCVE-2026-7345310.0An unauthenticated P4Runtime (Programming Protocol-Independent Packet Processors Runtime) client can achieve arbitrary code execution under CVE-2026-734548.1On affected platforms running Arista EOS with gRPC Network Security Interface (gNSI) Credentialz configured, a specially crafted request canCVE-2026-734557.5On affected platforms running Arista EOS with Open Shortest Path First version 3 (OSPFv3) configured, a specially crafted packet can cause tCVE-2026-7345610.0Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, an unautheCVE-2026-734575.3Under certain circumstances on affected platforms running Arista EOS with gRPC Network Packet Sampling Interface (gNPSI) enabled, the gNPSI CVE-2026-734588.2On affected platforms running Arista EOS with authenticated Bidirectional Forwarding Detection (BFD) sessions configured, a specially crafteCVE-2026-734597.4On affected platforms running Arista EOS with IS-IS configured, an unauthenticated attacker who can inject a specially crafted IS-IS LSP PDU
CVE-2026-73446: High severity, CVSS 7.4 | Vulnix