How severe is CVE-2014-2255?

CVE-2014-2255 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2014-2255 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-2255?

CVE-2014-2255 primarily affects Siemens Simatic S7-1500 Cpu Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-2255?

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-2014-2255 published?

CVE-2014-2255 was published on 2014-03-16 and last updated on 2026-06-17.

CVE-2014-2255

CVE-2014-2255 is a high-severity vulnerability in Siemens Simatic S7-1500 Cpu 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.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Siemens Simatic S7-1500 Cpu Firmware
Published: 2014-03-16
Last modified: 2026-06-17

Description

Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 allow remote attackers to cause a denial of service (defect-mode transition) via crafted HTTP packets.

Frequently asked questions

What is CVE-2014-2255?: Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 allow remote attackers to cause a denial of service (defect-mode transition) via crafted HTTP packets.
How severe is CVE-2014-2255?: CVE-2014-2255 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2014-2255 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-2255?: CVE-2014-2255 primarily affects Siemens Simatic S7-1500 Cpu Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-2255?: 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-2014-2255 published?: CVE-2014-2255 was published on 2014-03-16 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:siemens:simatic_s7-1500_cpu_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_firmware:1.0.1:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_firmware:1.1.0:*:*:*:*:*:*:*
cpe:2.3:o:siemens:simatic_s7-1500_cpu_firmware:1.1.1:*:*:*:*:*:*:*

More vulnerabilities in Siemens Simatic S7-1500 Cpu Firmware

CVE-2014-2251 — High (CVSS 8.3): The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have…
CVE-2014-2259 — High (CVSS 7.8): Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 allow remote attackers to cause a denial of service…
CVE-2014-2257 — High (CVSS 7.8): Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 allow remote attackers to cause a denial of service…
CVE-2019-10936 — High (CVSS 7.5): Affected devices improperly handle large amounts of specially crafted UDP packets. This could allow an…
CVE-2016-2200 — High (CVSS 7.5): Siemens SIMATIC S7-1500 CPU devices before 1.8.3 allow remote attackers to cause a denial of service (STOP mode…
CVE-2014-5074 — High (CVSS 7.1): Siemens SIMATIC S7-1500 CPU devices with firmware before 1.6 allow remote attackers to cause a denial of service…

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