The Siemens SIMATIC S7-1200 2.x PLC does not properly protect the private key of the SIMATIC CONTROLLER Certification Authority certificate…

published 2012-09-25 14y ago modified 2026-06-16 4mo ago also EUVD-2012-3015

cvss: 4.3; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits: 0; none known

The Siemens SIMATIC S7-1200 2.x PLC does not properly protect the private key of the SIMATIC CONTROLLER Certification Authority certificate, which allows remote attackers to spoof the S7-1200 web server by using this key to create a forged certificate.

Patch / fix

fixed in 9

siemens simatic_s7-1200_firmware 3.0.0
siemens simatic_s7-1200_cpu_1211c_firmware 3.0.0
siemens simatic_s7-1200_cpu_1212c_firmware 3.0.0
siemens simatic_s7-1200_cpu_1212fc_firmware 3.0.0
siemens simatic_s7-1200_cpu_1214_fc_firmware 3.0.0
siemens simatic_s7-1200_cpu_1214c_firmware 3.0.0
siemens simatic_s7-1200_cpu_1215_fc_firmware 3.0.0
siemens simatic_s7-1200_cpu_1215c_firmware 3.0.0
siemens simatic_s7-1200_cpu_1217c_firmware 3.0.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-12-263-01 updated 2025-06-05 cvss 9.3

Siemens S7-1200 Insecure Storage of HTTPS CA Certificate

Siemens SIMATIC S7-1200 V2.x
affected: mitigation

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.47% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-295 Improper Certificate Validation

References

siemens.com /corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-240718.pdf
broken-link, vendor-advisory
us-cert.gov /control_systems/pdf/ICSA-12-263-01.pdf
broken-link, third-party-advisory, us-government-resource
en.securitylab.ru /lab/PT-2012-48
third-party-advisory

Sources

CVE List CVE-2012-3037
NVD CVE-2012-3037

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