Cisco · IOS software
CVE-2017-12235
Cisco IOS Software for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service Vulnerability
What it is
A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS 12.2 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 vulnerability is due to the improper parsing of ingress PN-DCP Identify Request packets destined to an affected device. An attacker could exploit this vulnerability by sending a crafted PN-DCP Identify Request packet to an affected device and then continuing to send normal PN-DCP Identify Request packets to the device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. This vulnerability affects Cisco devices that are configured to process PROFINET messages. Beginning with Cisco IOS Software Release 12.2(52)SE, PROFINET is enabled by default on all the base switch module and expansion-unit Ethernet ports. Cisco Bug IDs: CSCuz47179.
CISA: A vulnerability in the implementation of the PROFINET Discovery and Configuration Protocol (PN-DCP) for Cisco IOS could allow an unauthenticated, remote 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 | for Cisco Integrated Services Routers Denial-of-Service | IOS software | Medium 6.5 | 2.2% |
| 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.