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CVE-2026-73450

Security Advisory 0161

CVSS 3.1 6.9 MEDIUMCVSS 4.0 7.0 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-73450

Published

On affected platforms running Arista EOS with MLAG Dual Primary Detection configured, an unauthenticated attacker with access to the Dual Primary Detection network segment can send specially crafted packets to interfere with the dual-primary state. If the MLAG primary switch fails while these packets are present, the secondary switch incorrectly concludes it is in a dual-primary condition and err-disables its interfaces, leading to a traffic interruption.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-73450

Published

EOS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Arista Networks",
                    "product": "EOS",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "4.36.0",
                            "lessThanOrEqual": "4.36.1F",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.35.0",
                            "lessThanOrEqual": "4.35.5M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.34.0",
                            "lessThanOrEqual": "4.34.7.1M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.33.0",
                            "lessThanOrEqual": "4.33.9M",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "0.0.0",
                            "lessThan": "4.33.0",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON