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CVE-2018-0173CISA KEV

Cisco IOS and IOS XE Software Improper Input Validation Vulnerability

CISA lists this Cisco IOS and IOS XE Software vulnerability as known exploited. The vendor's advisory has the fixed versions.

CISA KEVVendor advisoryNVD

CISA catalog record

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).

Product
IOS and IOS XE Software
Added to KEV
3 Mar 2022
Federal remediation due
17 Mar 2022
Known ransomware use
Not reported

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 15:58 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current

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