Exploited CVEs / Cisco / CVE-2018-0174
CVE-2018-0174
Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2022-03-17 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Cisco Security Advisories (PSIRT), linked below.
Actively exploited Cisco IOS XE Software vulnerability, High severity, CVSS 8.6. Added to the CISA KEV catalog 2022-03-03.
Risk summary
Updated July 27, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2018-0174
This flaw in the DHCP option 82 relay functionality of Cisco IOS and IOS XE lets a crafted DHCP packet crash the device, causing a denial of service on routers and switches acting as DHCP relay agents. Despite a modest 8 percent EPSS score and no ransomware link, CISA confirmed active exploitation and added it to the KEV catalog in March 2022, so exposure is real for edge and distribution gear handling DHCP relay.
Do this: Identify Cisco IOS and IOS XE devices configured as DHCP relay agents with option 82 and schedule an upgrade to a fixed release.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2018-0174
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2018-0174
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2022-03-17 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2018-0174
The authoritative fix and affected-version list are published by the vendor. Find the IOS XE Software advisory on Cisco Security Advisories (PSIRT).
Common questions about CVE-2018-0174
Is CVE-2018-0174 actively exploited?
Yes. CVE-2018-0174 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-03-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 7.8%.
What is the CISA deadline and required action for CVE-2018-0174?
CISA set the federal (BOD 22-01) remediation due date at 2022-03-17, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2018-0174?
The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched IOS XE Software versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2018-0174?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2018-0174's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
More exploited Cisco CVEs
The newest Cisco entries on the CISA KEV catalog:
All Cisco exploited CVEs on one page: Cisco vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
