CISA KEV · Known exploitedHigh

CVE-2020-3118

Cisco IOS XR

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 administrat...

CVSS: 8.8
EPSS: 11.7%
CISA KEV: Listed
Published: 2020.02.06

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability11.7%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Cisco IOS XR
Affected versions: unspecified, >= 6.6.0 < 6.6.12, >= 7.0.0 < 7.0.2, 6.5.3, 5.2.5, 6.4.2, 6.6.25, 7.0.1
Fixed versions: 6.6.12, 7.0.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.03

1
Identify
Confirm that Cisco IOS XR and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-134, CWE-787
KEV added: 2021.11.03
Ransomware use: 미확인