CVE-2017-12234

Name: CVE-2017-12234
Creator: NVD / NIST
Published: 2017-09-29T01:34:48.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 6.94%

Last modified Jun 17, 2026

CVE-2017-12234 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. CISA has confirmed active exploitation in the wild. EPSS estimates a 6.94% chance of exploitation in the next 30 days.

Description

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvc43709.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

6.94%

93.3th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Mar 24, 2022.

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Cisco	Ios	>= 12.4, <= 15.6

References

http://www.securityfocus.com/bid/101038Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039459Broken Link, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-cipVendor Advisory
http://www.securityfocus.com/bid/101038Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039459Broken Link, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-cipVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12234US Government Resource

Timeline

Published: Sep 29, 2017
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2017-12234?

How severe is CVE-2017-12234?

CVE-2017-12234 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 6.94% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2017-12234?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-12234?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST