CVE-2014-2256

What it is

Siemens SIMATIC S7-1200 CPU PLC devices with firmware before 4.0 allow remote attackers to cause a denial of service (defect-mode transition) via crafted ISO-TSAP packets, a different vulnerability than CVE-2014-2257.

At a glance

Exploitability

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

Exploit odds

3.7% chance of exploitation in the next 30 days (EPSS).

Fix

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

Timeline

1. 2014-03-24 14:20 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.7% in the next 30 days (EPSS).
• Severity: 7.8 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2014-03-24 14:20 UTC

Last modified

2026-06-17 00:06 UTC

Exploit probability

3.7% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Siemens Simatic s7 Cpu 1200 Firmware ≤ 3.0.2
• Siemens Simatic s7 Cpu 1200 Firmware 3.0
• Siemens Simatic s7 cpu-1211c
• Siemens Simatic s7 Cpu 1212c
• Siemens Simatic s7 Cpu 1214c
• Siemens Simatic s7 Cpu 1215c
• Siemens Simatic s7 Cpu 1217c

Attack profile CVSS 2.0 · 7.8

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

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