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CVE-2018-0173: Cisco IOS and IOS XE Software Improper Input Validation Vulnerability
Cisco IOS and IOS XE Software · in CISA KEV since 2022-03-03
2022-03-03added to KEV
2022-03-17federal remediation due date
7.61%EPSS exploit probability (30 days) 94.3th percentile
8.6 HIGHCVSS 3.1
Unknownknown ransomware use
1,436days from NVD publication to KEV
What it is
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).
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-20 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVD published | 2018-03-28 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2018-0173.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.