CVEvulnerability
CVE-2017-12240
CISA Known Exploited Vulnerability
Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability — Cisco IOS and IOS XE Software
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.
- Added to KEV
- 2022-03-03
- Remediation due
- 2022-03-24
- Ransomware use
- Unknown
- Required action
- Apply updates per vendor instructions.
- Notes
- https://nvd.nist.gov/vuln/detail/CVE-2017-12240
- Status
- Analyzed
- Published
- 2017-09-29
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 10.0 HIGH — AV:N/AC:L/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-119, CWE-20
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.
Affected configurations
• cisco ios (>= 12.2 <= 15.6)
Related
References
- http://www.securityfocus.com/bid/101034 Broken Link, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039445 Broken Link, Third Party Advisory, VDB Entry
- https://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390 Vendor Advisory
- https://quickview.cloudapps.cisco.com/quickview/bug/CSCuw77959 Vendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcp Vendor Advisory
- http://www.securityfocus.com/bid/101034 Broken Link, Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039445 Broken Link, Third Party Advisory, VDB Entry
- https://quickview.cloudapps.cisco.com/quickview/bug/CSCsm45390 Vendor Advisory
- https://quickview.cloudapps.cisco.com/quickview/bug/CSCuw77959 Vendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-dhcp Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12240 US Government Resource