CVE-2017-12235

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-08-03 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2017-09-29 01:34 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2022-03-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2022-03-24 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-06-17 01:02 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 7.1% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-09-29 01:34 UTC

Last modified

2026-06-17 01:02 UTC

Added to CISA KEV

2022-03-03

Exploit probability

7.1% · EPSS, next 30 days

Weakness

CWE-20 · Improper input validation

Record status

Analyzed

Affected

• Cisco iOS ≤ 15.6

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2017-12235.md and follow it. Check whether this project is affected by CVE-2017-12235. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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