CVE-2014-2251 — The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors

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HIGH

The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors

Published Mar 16, 2014

8.3

HIGH

CVSS 2.0

EPSS 2.74%

Description

The random-number generator on Siemens SIMATIC S7-1500 CPU PLC devices with firmware before 1.5.0 does not have sufficient entropy, which makes it easier for remote attackers to defeat cryptographic protection mechanisms and hijack sessions via unspecified vectors.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.74% 0.02744

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02744

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.74% (0.02744)	85.65th	v5 (v2026.06.15)
Jun 15, 2026	2.74% (0.02744)	84.19th	v5 (v2026.06.15)
Mar 17, 2025	1.19% (0.01188)	77.37th	v4 (v2025.03.14)
Dec 12, 2024	0.56% (0.00559)	78.39th	v3 (v2023.03.01)
Feb 8, 2024	0.56% (0.00559)	76.96th	v3 (v2023.03.01)
Mar 7, 2023	0.56% (0.00559)	74.23th	v3 (v2023.03.01)
Mar 6, 2023	1.14% (0.01136)	59.45th	v2 (v2022.01.01)
Oct 18, 2022	1.14% (0.01136)	58.28th	v2 (v2022.01.01)
Apr 1, 2022	1.14% (0.01136)	56.27th	v2 (v2022.01.01)
Feb 4, 2022	1.14% (0.01136)	34.23th	v2 (v2022.01.01)

Weaknesses (0)

No CWE recorded.

References (3)

http://ics-cert.us-cert.gov/advisories/ICSA-14-073-01
x_refsource_MISCUS Government Resource
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-456423.pdf
x_refsource_CONFIRMPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-456423.pdf
x_refsource_CONFIRM

Link	Providers	Tags
http://ics-cert.us-cert.gov/advisories/ICSA-14-073-01		x_refsource_MISCUS Government Resource
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-456423.pdf		x_refsource_CONFIRMPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-456423.pdf		x_refsource_CONFIRM

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Mar 16, 2014

Updated Aug 6, 2024

Reserved Feb 28, 2014

Link CVE-2014-2251

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2014-2251

Red Hat

Severity n/a

Public date n/a

Links CVE-2014-2251