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CVE-2020-3118

CWE-134

Critical

96.0

RPS

Description

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).

Source: NVD

Signals

CVSS
8.8
High · v3.1
EPSS
11.68%
Probability of exploitation in the next 30 days (FIRST)
CISA KEV
In CISA KEV since Nov 2021
Fix commit
No known fix commit
Sources: MoreFixes, FreshFixes
Weakness
CWE-134
CWE-134, CWE-787
Published
5 Feb 2020
Last modified 28 Oct 2025

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Data as of 7 Oct 2026, 05:16 UK time

CVE-2020-3118 · RPS 96.0 · DevSecure Intelligence