A vulnerability has been identified in SIMATIC S7-1200 CPU family version 4 (All versions < V4.2.3).

published 2018-10-10 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-5736

cvss: 7.3; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits: 0; none known

A vulnerability has been identified in SIMATIC S7-1200 CPU family version 4 (All versions < V4.2.3). The web interface could allow a Cross-Site Request Forgery (CSRF) attack if an unsuspecting user is tricked into accessing a malicious link. Successful exploitation requires user interaction by a legitimate user, who must be authenticated to the web interface. A successful attack could allow an attacker to trigger actions via the web interface that the legitimate user is allowed to perform. This could allow the attacker to read or modify parts of the device configuration.

Patch / fix

fixed in 1

siemens simatic_s7-1200_v4_firmware 4.2.3

Vendor advisories

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

cisa ICSA-18-282-04 updated 2020-02-10 cvss 7.5

Siemens SIMATIC S7-1200 CPU Family Version 4

Siemens SIMATIC S7-1200 CPU family version 4 (incl. SIPLUS variants) <V4.2.3
affected: fixed in V4.2.3, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.3	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
NVD	2.0	4.9	AV:N/AC:M/Au:S/C:P/I:P/A:N

Affected products

Siemens AG SIMATIC S7-1200 CPU family version 4

Classification

Weakness

CWE-352 Cross-Site Request Forgery

References

cert-portal.siemens.com /productcert/pdf/ssa-507847.pdf
vendor-advisory
securityfocus.com /bid/105542
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-13800
NVD CVE-2018-13800

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Summary