What’s Vulnerable › Vulnerabilities

CVE-2017-12232: Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2022-03-03
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-09-29 · updated 2026-06-17
• Weakness: CWE-399

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.

Affected products

• Cisco IOS: from 15.0 through 15.6

References

• http://www.securityfocus.com/bid/101044
• http://www.securitytracker.com/id/1039452
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-rbip-dos
• http://www.securityfocus.com/bid/101044
• http://www.securitytracker.com/id/1039452
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-rbip-dos
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-12232

Get alerted when CVE-2017-12232 or the next vulnerability affects your stack