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Category:   Device (Router/Bridge/Hub)  >   Cisco IOS Vendors:   Cisco
Cisco IOS/IOS XE Buffer Overflow in DHCP Relay Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1039445
SecurityTracker URL:
CVE Reference:   CVE-2017-12240   (Links to External Site)
Date:  Sep 27 2017
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Cisco IOS/IOS XE. A remote user can execute arbitrary code on the target system.

A remote user can send a specially crafted DHCPv4 packet to trigger a buffer overflow in the DHCP relay subsystem and execute arbitrary code on the target system. This can be exploited to gain full control of the target system.

Systems configured for DHCP relay are affected.

The vendor has assigned bug IDs CSCsm45390 and CSCuw77959 to this vulnerability.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error

Message History:   None.

 Source Message Contents

[Original Message Not Available for Viewing]

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