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CVE-2026-73446

Security Advisory 0160

CVSS 3.1 7.4 HIGHCVSS 4.0 7.0 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-73446

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-73446

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": "4.32.0",
                            "lessThan": "4.33.0F",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "4.31.0",
                            "lessThan": "4.32.0F",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

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