CVE-2017-12235

Cisco IOS software: for Cisco Industrial Ethernet Switches PROFINET Denial-of-Service

As of , CVE-2017-12235 in Cisco IOS software is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 3 March 2022
US federal deadline
24 March 202221 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.07Higher than 94% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.01 on 3 March 2022EPSS on the day CISA listed it.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

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.

CISA's description

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.

The CVE record's description, from cisco

CVE published
28 September 2017
Assigned by
cisco
CVSS
7.5 High (CVSS 3.1, from CISA-ADP)
CWE-20
Improper Input Validation
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
partial

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

IOS software: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2017-6744SNMP Remote Code ExecutionCisco IOS softwarePatch soon0.07
CVE-2017-12231Network Address Translation Denial-of-ServiceCisco IOS softwarePatch soon0.07
CVE-2017-12233Common Industrial Protocol Request Denial-of-ServiceCisco IOS softwarePatch soon0.07
CVE-2017-12234Common Industrial Protocol Request Denial-of-ServiceCisco IOS softwarePatch soon0.07
CVE-2018-0154Integrated Services Module for VPN Denial-of-ServiceCisco IOS SoftwarePatch soon0.07
CVE-2018-0179Denial-of-ServiceCisco IOS SoftwarePatch soon0.05
CVE-2018-0180Denial-of-ServiceCisco IOS SoftwarePatch soon0.05
CVE-2018-0161Resource Management ErrorsCisco IOS SoftwarePatch soon0.04
CVE-2017-12232for Cisco Integrated Services Routers Denial-of-ServiceCisco IOS softwarePatch soon0.02

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