CVE-2018-0174

HIGH8.6

CISA KEV

Published 2018-03-28 · Updated 2026-06-17 · Source psirt@cisco.com

Summary

CVE-2018-0174 is a high-severity (CVSS 8.6) vulnerability in Cisco IOS XE Software. CISA added it to the Known Exploited Vulnerabilities catalog on March 3, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 17, 2022. CISA does not currently list it as used in ransomware campaigns. Cisco has 101 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.

All 101 known-exploited Cisco vulnerabilities →

Description

A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuh91645.

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

CWE-20CWE-20

CISA Known-Exploited Vulnerability

Product: Cisco — IOS XE Software

Name: Cisco IOS Software and Cisco IOS XE Software Improper Input Validation Vulnerability

Date added: 2022-03-03 · Due: 2022-03-17

Required action: Apply updates per vendor instructions.

References

View on NVD

More exploited Cisco vulnerabilities

Most recently added to CISA KEV

CVE-2026-76519
Secure Email Gateway — Cisco Secure Email Gateway Relative Path Traversal Vulnerability
added 2026-10-14
CVE-2026-76504
Catalyst SD-WAN Manager — Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability
added 2026-09-30
CVE-2026-76460
Identity Services Engine — Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability
added 2026-09-16
CVE-2026-76461
Secure Email Gateway — Cisco Secure Email Gateway SQL Injection Vulnerability
added 2026-09-14
CVE-2026-20079
Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management — Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel Vulnerability
added 2026-09-09
CVE-2026-20349
Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) — Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability
added 2026-08-11

View all →

Related CVEs

Same severity, most recent

CVE-2026-96660
The User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Checkbox Field Value in all versions up to, and including, 5.2.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The nopriv AJAX action user_registration_user_form_submit reaches ur_process_registration() without nonce validation, meaning any unauthenticated request can reach the vulnerable code path.
2026-10-17 · score 7.2
CVE-2026-92798
The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2.8 This is due to insufficient input sanitization in the 'referrer_url' branch of UR_Smart_Tags::process(), where the attacker-controlled HTTP_REFERER header is only passed through sanitize_text_field() — which does not strip WordPress shortcode delimiters — before being substituted into a Content Restriction message that is subsequently executed via apply_shortcodes()/do_shortcode(). This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes on any restricted page whose message uses the supported {{referrer_url}} smart tag.
2026-10-17 · score 8.1
CVE-2026-108123
The WP Booking System – Booking Calendar plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.1.0.3 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to read the stored notification email body of any booking by iterating booking_id and email_log_id, exposing customer PII including names, email addresses, phone numbers, messages, and booking dates intended to be visible only to administrators. This is exploitable by any Subscriber-level user because admin_init fires on profile.php, a wp-admin page accessible to all authenticated users.
2026-10-17 · score 7.5
CVE-2026-103899
The EU VAT Assistant for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'vat_number' parameter in all versions up to, and including, 2.1.30.260413 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The stored payload executes in the administrator's browser context when reviewing an order via WooCommerce → Orders → Edit Order, enabling privilege escalation up to and including full site takeover via rogue administrator account creation.
2026-10-17 · score 7.2
CVE-2026-109208
The LearnPress – WordPress LMS Plugin for Create and Sell Online Courses plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'quantity (REST) / order_comments (checkout)' parameter in all versions up to, and including, 4.4.10 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. With guest checkout enabled the attack is fully unauthenticated; with guest checkout disabled, any Subscriber-level user can exploit both vectors through their own checkout.
2026-10-17 · score 7.2