Cisco · IOS software
CVE-2017-12232
Cisco IOS Software for Cisco Integrated Services Routers Denial-of-Service Vulnerability
What it is
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.
CISA: A vulnerability in the implementation of a protocol in Cisco Integrated Services Routers Generation 2 (ISR G2) Routers running Cisco IOS could allow an unauthenticated, adjacent attacker to cause an affected device to reload, resulting in a denial of service.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: March 24, 2022
More exploited flaws from Cisco
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Mar 3, 2022 | SNMP Remote Code Execution | IOS software | High 8.8 | 7.3% |
| Mar 3, 2022 | Integrated Services Module for VPN Denial-of-Service | IOS Software | High 7.5 | 7.1% |
| Mar 3, 2022 | Resource Management Errors | IOS Software | Medium 6.3 | 4.1% |
| Mar 3, 2022 | Denial-of-Service | IOS Software | Medium 6.8 | 4.9% |
| Mar 3, 2022 | Denial-of-Service | IOS Software | Medium 6.8 | 4.9% |
| Mar 3, 2022 | Network Address Translation Denial-of-Service | IOS software | High 7.5 | 7.1% |
| Mar 3, 2022 | Common Industrial Protocol Request Denial-of-Service | IOS software | High 7.5 | 7.1% |
| Mar 3, 2022 | Common Industrial Protocol Request Denial-of-Service | IOS software | High 7.5 | 7.1% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.