How severe is CVE-2014-2256?

CVE-2014-2256 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2014-2256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-2256?

CVE-2014-2256 primarily affects Siemens Simatic S7 Cpu 1200 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-2256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2014-2256 published?

CVE-2014-2256 was published on 2014-03-24 and last updated on 2026-06-17.

CVE-2014-2256

CVE-2014-2256 is a high-severity vulnerability in Siemens Simatic S7 Cpu 1200 Firmware with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Siemens Simatic S7 Cpu 1200 Firmware
Published: 2014-03-24
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2014-2256?: 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.
How severe is CVE-2014-2256?: CVE-2014-2256 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2014-2256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-2256?: CVE-2014-2256 primarily affects Siemens Simatic S7 Cpu 1200 Firmware. In total, 7 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-2256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2014-2256 published?: CVE-2014-2256 was published on 2014-03-24 and last updated on 2026-06-17.

References

Affected products (7)

cpe:2.3:o:siemens:simatic_s7_cpu_1200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7_cpu_1200_firmware:3.0:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7_cpu-1211c:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7_cpu_1212c:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7_cpu_1214c:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7_cpu_1215c:-:*:*:*:*:*:*:*
cpe:2.3:h:siemens:simatic_s7_cpu_1217c:-:*:*:*:*:*:*:*

More vulnerabilities in Siemens Simatic S7 Cpu 1200 Firmware

CVE-2014-2250 — High (CVSS 8.3): The random-number generator on Siemens SIMATIC S7-1200 CPU PLC devices with firmware before 4.0 does not have…
CVE-2014-2258 — High (CVSS 7.8): Siemens SIMATIC S7-1200 CPU PLC devices with firmware before 4.0 allow remote attackers to cause a denial of service…
CVE-2014-2254 — High (CVSS 7.8): Siemens SIMATIC S7-1200 CPU PLC devices with firmware before 4.0 allow remote attackers to cause a denial of service…
CVE-2016-2846 — Medium (CVSS 6.5): Siemens SIMATIC S7-1200 CPU devices before 4.0 allow remote attackers to bypass a "user program block" protection…
CVE-2014-2252 — Medium (CVSS 6.1): Siemens SIMATIC S7-1200 CPU PLC devices with firmware before 4.0 allow remote attackers to cause a denial of service…
CVE-2014-2909 — Medium (CVSS 5.8): CRLF injection vulnerability in the integrated web server on Siemens SIMATIC S7-1200 CPU devices 2.x and 3.x allows…

All CVEs affecting Siemens Simatic S7 Cpu 1200 Firmware →

Other CWE-399 (Resource Management Errors) vulnerabilities

CVE-2015-8104 — Critical (CVSS 10.0): The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a…
CVE-2015-0339 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0335 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
CVE-2014-0560 — Critical (CVSS 10.0): Use-after-free vulnerability in Adobe Reader and Acrobat 10.x before 10.1.12 and 11.x before 11.0.09 on Windows and OS…

Browse all CWE-399 (Resource Management Errors) vulnerabilities →