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CVE-2017-12240

9.8 · CRITICALActively Exploited

The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 and Cisco IOS XE Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code and gain fu…

Published Sep 29, 2017CWE-20EPSS 13.77%

Overview

CVE-2017-12240 is a critical-severity vulnerability. It was published on September 29, 2017 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The DHCP relay subsystem of Cisco IOS 12.2 through 15.6 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. The attacker could also cause an affected system to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a buffer overflow condition in the DHCP relay subsystem of the affected software. An attacker could exploit this vulnerability by sending a crafted DHCP Version 4 (DHCPv4) packet to an affected system. A successful exploit could allow the attacker to execute arbitrary code and gain full control of the affected system or cause the affected system to reload, resulting in a DoS condition. Cisco Bug IDs: CSCsm45390, CSCuw77959.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/101034Refwww.securitytracker.com/id/1039445Refquickview.cloudapps.cisco.com/quickview/bug/CSCsm45390Refquickview.cloudapps.cisco.com/quickview/bug/CSCuw77959Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcpRefwww.securityfocus.com/bid/101034Refwww.securitytracker.com/id/1039445Refquickview.cloudapps.cisco.com/quickview/bug/CSCsm45390Refquickview.cloudapps.cisco.com/quickview/bug/CSCuw77959Reftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcp

How CyberStrike helps

Frequently asked questions

What is CVE-2017-12240?

CVE-2017-12240 is a critical-severity vulnerability. It was published on September 29, 2017 and has a CVSS 3.1 base score of 9.8 (CRITICAL). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2017-12240?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-12240?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-12240?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-12240 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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