Executive Summary

Name CVE-2017-12240 First vendor Publication 2017-09-28
Vendor Cve Last vendor Modification 2019-10-09

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 9.8
Base Score 9.8 Environmental Score 9.8
impact SubScore 5.9 Temporal Score 9.8
Exploitabality Sub Score 3.9
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
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Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 10 Attack Range Network
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12240

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-119 Failure to Constrain Operations within the Bounds of a Memory Buffer
50 % CWE-20 Improper Input Validation

CPE : Common Platform Enumeration

Os 2762

Snort® IPS/IDS

Date Description
2014-01-10 Multiple Operating Systems invalid DHCP option attempt
RuleID : 7196 - Revision : 13 - Type : OS-OTHER

Nessus® Vulnerability Scanner

Date Description
2017-10-02 Name : The remote device is missing a vendor-supplied security patch.
File : cisco-sa-20170927-dhcp-ios.nasl - Type : ACT_GATHER_INFO

Sources (Detail)

Source Url
BID http://www.securityfocus.com/bid/101034
CONFIRM https://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390
SECTRACK http://www.securitytracker.com/id/1039445

Alert History

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Date Informations
2021-05-04 12:57:43
  • Multiple Updates
2021-04-22 02:11:20
  • Multiple Updates
2020-05-23 00:55:27
  • Multiple Updates
2019-10-10 05:19:42
  • Multiple Updates
2017-10-06 21:24:08
  • Multiple Updates
2017-10-03 13:24:35
  • Multiple Updates
2017-09-30 09:23:38
  • Multiple Updates
2017-09-29 09:24:19
  • First insertion