Is CVE-2017-12240 actively exploited?

Yes. CVE-2017-12240 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2017-12240 be exploited remotely?

The attack vector of CVE-2017-12240 has not been classified yet.

What is the CVSS score of CVE-2017-12240?

CVE-2017-12240 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2017-12240

HIGHCISA KEVIN THE WILD

CVE-2017-12240

Published: March 3, 2022

EPSS:9.90%probability of exploitation in 30 daysPercentile:92.9th

Official Description

The Dynamic Host Configuration Protocol (DHCP) relay subsystem of Cisco IOS and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system.

NVD Source

CISA KEV Advisory

Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability

Added to KEV: 2022-03-03Federal patch deadline: 2022-03-24

Required Action (CISA)

Apply updates per vendor instructions.

Risk Analysis

A vulnerability in the DHCP relay subsystem of Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to execute arbitrary code and gain full control of an affected system. This is a high-severity issue with a notable exploitation probability (EPSS 0.09901). This vulnerability is confirmed to be actively exploited by CISA.

This vulnerability is being actively exploited in the wild. It is remotely exploitable by unauthenticated attackers.

Recommended Action

Apply available patches and upgrades for Cisco IOS and Cisco IOS XE Software. Review and harden DHCP relay configurations and network access controls.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2017-12240 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2017-12240 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.