CVE-2026-121287: Security Advisory 0221

Published Nov 10, 2026

Updated

An unauthenticated attacker on an adjacent network segment can send crafted RIPv2 packets to a RIP-enabled interface on the device to trigger the Rip agent crash without providing valid credentials. Repeated exploitation reliably interrupts routing service on the affected device, which may also disrupt routing for other devices that depend on it. In a worst-case scenario, the vulnerability may allow an attacker to execute arbitrary code on the affected device.

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Upgrade to a fixed release to a version that resolves this vulnerability.
Patch Security Advisory 0221

Event History

Nov 10, 2026

CVE Published

via MITRE·08:09 PM

Data Sourced

via MITRE·08:09 PM

DescriptionSeverityWeakness

Frequently Asked Questions

Which systems are exposed to exploitation?

Devices with a RIP-enabled interface that can receive RIPv2 packets from an adjacent network segment are exposed. The attacker does not need valid credentials.

What does an attacker need to exploit this issue?

An attacker needs network adjacency to the affected device and the ability to send crafted RIPv2 packets to a RIP-enabled interface. No authentication or user interaction is required.

What is the likely operational impact?

Exploitation can crash the RIP agent and interrupt routing service on the affected device. Repeated attacks can also disrupt routing for other devices that depend on the affected device, and the worst-case impact includes arbitrary code execution.

CVE-2026-121287: Security Advisory 0221

Remediation

Event History

Frequently Asked Questions

Which systems are exposed to exploitation?

What does an attacker need to exploit this issue?

What is the likely operational impact?

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Frequently Asked Questions

Which systems are exposed to exploitation?

What does an attacker need to exploit this issue?

What is the likely operational impact?