Cross-site scripting (XSS) vulnerability in the web server on Siemens SIMATIC S7-1200 PLCs 2.x through 3.0.1 allows remote attackers to inj…

published 2012-10-10 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3018

cvss: 4.3; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.6%; EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

Cross-site scripting (XSS) vulnerability in the web server on Siemens SIMATIC S7-1200 PLCs 2.x through 3.0.1 allows remote attackers to inject arbitrary web script or HTML via a crafted URI.

Patch / fix

fixed in 9

siemens simatic_s7-1200_firmware 3.0.2
siemens simatic_s7-1200_cpu_1211c_firmware 3.0.2
siemens simatic_s7-1200_cpu_1212c_firmware 3.0.2
siemens simatic_s7-1200_cpu_1212fc_firmware 3.0.2
siemens simatic_s7-1200_cpu_1214_fc_firmware 3.0.2
siemens simatic_s7-1200_cpu_1214c_firmware 3.0.2
siemens simatic_s7-1200_cpu_1215_fc_firmware 3.0.2
siemens simatic_s7-1200_cpu_1215c_firmware 3.0.2
siemens simatic_s7-1200_cpu_1217c_firmware 3.0.2

Vendor advisories

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

cisa ICSA-12-283-01 updated 2025-06-05 cvss 8.3

Siemens S7-1200 Web Application Cross Site Scripting

Siemens SIMATIC S7-1200 PLC V2.x, V3.0.0, V3.0.1
affected: mitigation “For this version of firmware (3.0.2), Siemens has also removed the HTTP PUT functionality, because it is not used by the S7-1200 Web server.” cert-portal.siemens.com

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

2.56% chance of exploitation in the next 30 days, higher than 85% 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:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

siemens.com /corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-279823.pdf
broken-link, vendor-advisory
secunia.com /advisories/50816
third-party-advisory
us-cert.gov /control_systems/pdf/ICSA-12-283-01.pdf
broken-link, third-party-advisory, us-government-resource
osvdb.org /86130
vdb-entry, broken-link
en.securitylab.ru /lab/PT-2012-50
third-party-advisory

Sources

CVE List CVE-2012-3040
NVD CVE-2012-3040

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary