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CVE-2020-3118

8.8
HIGHCVSS v3.1 Base Score
0.20%
LOW RiskEPSS (42nd percentile)
KEV

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).

Published: 2/5/2020
Modified: 10/28/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Cisco IOS XR Software Discovery Protocol Format String Vulnerability

Vendor / Product:

Cisco IOS XR

Required Action:

Apply updates per vendor instructions.

Due Date: 5/3/2022(OVERDUE)
Added to KEV:

11/3/2021

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2020-3118

Vulnerability Summary

CVSS v3 Score

8.8HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2 Score

8.3

AV:A/AC:L/Au:N/C:C/I:C/A:C

EPSS Score (Exploitation Probability)

0.20%LOW Exploitation Risk
42nd percentile

This vulnerability has a 0.20% probability of being exploited in the next 30 days, ranking higher than 42% of all scored CVEs.

CWE Classification

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Similar SeverityHIGH