Cisco IOS and IOS XE Software Improper Input Validation Vulnerability

Technical Severity

CVSS v3.1 Metrics

HIGH

8.6 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

EPSS Prediction

5.42 %

Predictive Probability

Percentile Rank

90.1 th

Documented as more likely to be exploited than 90.1% of known CVEs.

Detection Date

Mar 03, 2022

Remediation Due

Mar 17, 2022

CISA Catalog Active

Threat Analysis

A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).

Remediation Directive

Apply updates per vendor instructions.

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2018-0173