CVE-2017-12232

Name: CVE-2017-12232
Creator: NVD / NIST
Published: 2017-09-29T01:34:48.78+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10Actively ExploitedEPSS 2.17%

Last modified Jun 17, 2026

CVE-2017-12232 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a misclassification of Ethernet frames. CISA has confirmed active exploitation in the wild. EPSS estimates a 2.17% chance of exploitation in the next 30 days.

Description

A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS 15.0 through 15.6 could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to a misclassification of Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to 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: CSCvc03809.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

2.17%

80.0th 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-399

Affected Software

Vendor	Product	Versions
Cisco	Ios	>= 15.0, <= 15.6

References

http://www.securityfocus.com/bid/101044Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039452Broken Link, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-rbip-dosVendor Advisory
http://www.securityfocus.com/bid/101044Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039452Broken Link, Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-rbip-dosVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12232US Government Resource

Timeline

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

Frequently Asked Questions

What is CVE-2017-12232?

How severe is CVE-2017-12232?

CVE-2017-12232 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.17% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2017-12232?

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-2017-12232?

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

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Source: NVD / NIST