Live › vulnerability › CVE-2020-3118
Go to dashboardCisco IOS XR network devices improperly validate string fields in Cisco Discovery Protocol messages, which causes a format string flaw. An unauthenticated attacker on the same network segment can run code with administrative privileges or force the device to reload.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Cisco IOS XR | vendor | – | – |
Unknown from the sources. In the analyst’s queue.
Apply the update per Cisco's vendor advisory; the sources do not name the fixed IOS XR versions.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
A vulnerability in the Cisco Discovery Protocol implementation for Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to execute arbitrary code or cause a reload on an affected device. The vulnerability is due to improper validation of string input from certain fields in Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to cause a stack overflow, which could allow the attacker to execute arbitrary code with administrative privileges on an affected device. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
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