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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.74%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 2.0
- 8.3 HIGHAV:N/AC:M/Au:N/C:P/I:P/A:C
- EPSS
- 2.74% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- siemens/simatic s7-1500 cpu firmware
- Source
- cve@mitre.org
EPSS 2.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://ics-cert.us-cert.gov/advisories/ICSA-14-073-01US Government Resource
- http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-456423.pdfPatch, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-456423.pdf
- http://ics-cert.us-cert.gov/advisories/ICSA-14-073-01US Government Resource
- http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-456423.pdfPatch, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-456423.pdf
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.