Security Advisory 0171

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73435
StatePUBLISHED
AssignerArista
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 10:16:51 UTC
Updated2026-09-16 19:09:28 UTC
DescriptionOn affected platforms running Arista EOS with Open Shortest Path First version 2 (OSPFv2) configured, a specially crafted OSPFv2 packet from an unauthenticated attacker on the same broadcast segment, with OSPFv2 authentication configured can cause adjacency flapping and packet loss. The disruption can affect routing across the broader OSPF domain.

Risk And Classification

Primary CVSS: v4.0 7 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.001630000 probability, percentile 0.059230000 (date 2026-09-16)

Problem Types: CWE-345 | CWE-345 CWE-345 Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary7HIGHCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/C...
4.0CNACVSS7HIGHCVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H
3.1CNACVSS8.2HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:H

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Arista Networks EOS affected 4.36.0F 4.36.1F custom 710 Series, 720D Series, 720XP/722XPM Series, 750X Series, 7010 Series, 7010X Series, 7020R/R4 Series, 7130 Series running EOS, 7150 Series, 7160 Series, 7170 Series, 7050X/X2/X3/X4 Series, 7060X/X2/X4/X5/X6 Series, 7250X Series, 7260X/X3 Series, 7280R/R2/R3/R4 Series, 7300X/X3 Series, 7320X Series, 7358X4 Series, 7368X4 Series, 7388X5 Series, 7500R/R2/R3 Series, 7800R3/R4 Series, 7700R4 Series, AWE 5000 Series, AWE 7200R Series, CloudEOS, cEOS-lab, vEOS-lab, CloudVision eXchange, virtual or physical appliance
CNA Arista Networks EOS affected 4.35.0F 4.35.5M custom 710 Series, 720D Series, 720XP/722XPM Series, 750X Series, 7010 Series, 7010X Series, 7020R/R4 Series, 7130 Series running EOS, 7150 Series, 7160 Series, 7170 Series, 7050X/X2/X3/X4 Series, 7060X/X2/X4/X5/X6 Series, 7250X Series, 7260X/X3 Series, 7280R/R2/R3/R4 Series, 7300X/X3 Series, 7320X Series, 7358X4 Series, 7368X4 Series, 7388X5 Series, 7500R/R2/R3 Series, 7800R3/R4 Series, 7700R4 Series, AWE 5000 Series, AWE 7200R Series, CloudEOS, cEOS-lab, vEOS-lab, CloudVision eXchange, virtual or physical appliance
CNA Arista Networks EOS affected 4.34.0F 4.34.7M custom 710 Series, 720D Series, 720XP/722XPM Series, 750X Series, 7010 Series, 7010X Series, 7020R/R4 Series, 7130 Series running EOS, 7150 Series, 7160 Series, 7170 Series, 7050X/X2/X3/X4 Series, 7060X/X2/X4/X5/X6 Series, 7250X Series, 7260X/X3 Series, 7280R/R2/R3/R4 Series, 7300X/X3 Series, 7320X Series, 7358X4 Series, 7368X4 Series, 7388X5 Series, 7500R/R2/R3 Series, 7800R3/R4 Series, 7700R4 Series, AWE 5000 Series, AWE 7200R Series, CloudEOS, cEOS-lab, vEOS-lab, CloudVision eXchange, virtual or physical appliance
CNA Arista Networks EOS affected 4.33.0F 4.33.9M custom 710 Series, 720D Series, 720XP/722XPM Series, 750X Series, 7010 Series, 7010X Series, 7020R/R4 Series, 7130 Series running EOS, 7150 Series, 7160 Series, 7170 Series, 7050X/X2/X3/X4 Series, 7060X/X2/X4/X5/X6 Series, 7250X Series, 7260X/X3 Series, 7280R/R2/R3/R4 Series, 7300X/X3 Series, 7320X Series, 7358X4 Series, 7368X4 Series, 7388X5 Series, 7500R/R2/R3 Series, 7800R3/R4 Series, 7700R4 Series, AWE 5000 Series, AWE 7200R Series, CloudEOS, cEOS-lab, vEOS-lab, CloudVision eXchange, virtual or physical appliance
CNA Arista Networks EOS affected 1.0.0 4.33.0F custom 710 Series, 720D Series, 720XP/722XPM Series, 750X Series, 7010 Series, 7010X Series, 7020R/R4 Series, 7130 Series running EOS, 7150 Series, 7160 Series, 7170 Series, 7050X/X2/X3/X4 Series, 7060X/X2/X4/X5/X6 Series, 7250X Series, 7260X/X3 Series, 7280R/R2/R3/R4 Series, 7300X/X3 Series, 7320X Series, 7358X4 Series, 7368X4 Series, 7388X5 Series, 7500R/R2/R3 Series, 7800R3/R4 Series, 7700R4 Series, AWE 5000 Series, AWE 7200R Series, CloudEOS, cEOS-lab, vEOS-lab, CloudVision eXchange, virtual or physical appliance

References

ReferenceSourceLinkTags
www.arista.com/en/support/advisories-notices/security-advisory/24727-securit... [email protected] www.arista.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below. CVE-2026-73435 has been fixed in the following releases: - 4.36.2F and later releases in the 4.36.x train - 4.35.6M and later releases in the 4.35.x train - 4.34.7.1M and later releases in the 4.34.x train - 4.33.10M and later releases in the 4.33.x train A hotfix is available for the following releases: 4.36.1F, 4.35.5M, 4.34.7M, 4.33.9M. URL: https://www.arista.com/support/advisories-notices/sa-download/?sa171-SecurityAdvisory171_CVE-2026-73435.swix SWIX hash (SHA512): 4c4ff053d8165f347b45dfcafc2d20396e3eb00869b0088f3128be7f53b2a028b479fa8279849c800b5916ab9aaf8077718a68e3bf4277d55b44076650de0aa7 Note: Installing/uninstalling the SWIX will cause the Ospf process to restart.

Workarounds

CNA: No mitigation is available for CVE-2026-73435.

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