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CVE-2026-77190

Security Advisory 0177

CVSS 3.1 6.5 MEDIUMCVSS 4.0 6.0 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-77190

Published

On affected platforms running Arista EOS, an unauthenticated attacker who is network-adjacent to the switch and able to connect to a device with PIM Sparse Mode and MLAG configured, can send malformed messages that cause the Pimsm agent to terminate unexpectedly. The Pimsm agent is automatically restarted, but repeated attacks can cause the agent to restart continuously, resulting in a sustained denial of service.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-77190

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",
                    "platforms": [
                        "710 Series",
                        "720D Series",
                        "720XP/722XPM Series",
                        "750X Series",
                        "7010TX Series",
                        "7020R/R4 Series",
                        "7130 Series running EOS",
                        "7170 Series",
                        "7050X3/X4 Series",
                        "7060X/X2/X4/X5/X6 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",
                        "cEOS-lab",
                        "vEOS-lab"
                    ],
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "4.36.0F",
                            "lessThanOrEqual": "4.36.1F",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.35.0F",
                            "lessThanOrEqual": "4.35.5M",
                            "status": "affected",
                            "versionType": "custom"
                        },
                        {
                            "version": "4.34.2F",
                            "lessThanOrEqual": "4.34.7M",
                            "status": "affected",
                            "versionType": "custom"
                        }
                    ]
                }

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