CVE-2017-12240: Cisco IOS and IOS XE Software DHCP Remote Code Execution Vulnerability

CVE-2017-12240 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2022-03-03

A buffer overflow vulnerability in the DHCP relay subsystem of Cisco IOS and IOS XE Software allows an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service. The flaw is triggered by sending crafted DHCPv4 packets to an affected device.

Technologies: Cisco IOS, Cisco IOS XE, Cisco IOS XE Software, Cisco IOS XR. Vendors: Cisco.

Quick answers

Is CVE-2017-12240 exploited in the wild?
Yes. CVE-2017-12240 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.
How severe is CVE-2017-12240?
Critical severity, with a CVSS score of 9.8, published 3 March 2022.
Which products and versions are affected?
Cisco IOS 12.2 through 15.6; Cisco IOS XE.
Is there a fix for CVE-2017-12240?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2017-12240 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2017-12240?
Check whether you run Cisco IOS, Cisco IOS XE, Cisco IOS XE Software or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Cisco IOS 12.2 through 15.6
  • Cisco IOS XE

Timeline

  • 2017-09-27: advisory: Initial Cisco advisory published
  • 2022-03-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

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