CVE-2018-0173

criticalknown exploitedcovered by 1 sourcefirst seen 2022-03-03

Actively exploited. CVE-2018-0173 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

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).

CSIRTS triage

What: A vulnerability can allow for denial-of-service in Cisco IOS and IOS XE Software.
Who is affected: Users of Cisco IOS and IOS XE Software.
Urgency: Remediation is urgent due to active exploitation and critical severity.
Action: Apply the latest updates from Cisco.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch CVE-2018-0173

Get an email if CVE-2018-0173 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 94% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2018-0173: Cisco IOS and IOS XE Software Improper Input Validation Vulnerabilitycisa-kev · 2022-03-03

External references

NVD record for CVE-2018-0173

CVE.org record

CISA KEV catalog

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2018-0173 status](https://www.csirts.com/badge/CVE-2018-0173)](https://www.csirts.com/cve/CVE-2018-0173)