A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.62).

published 2026-10-13 27 d ago modified 2026-10-15 24 d ago also EUVD-2026-98393

cvss: 5.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.62). Affected applications do not properly redact PLC restore passwords from HTTP error exception messages.

This could allow an attacker with access to logs or other diagnostic output to obtain the plaintext restore password and potentially perform unauthorized operations on the PLC.

Patch / fix

fixed in 1

Siemens .NET Client Library for SIMATIC S7 Webserver API V3.3.62

Vendor advisories

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

cisa ICSA-26-295-10 updated 2026-10-22 cvss 5.5

Siemens SIMATIC S7 Webserver API

Siemens .NET Client Library for SIMATIC S7 Webserver API < 3.3.62
affected: fixed in V3.3.62 github.com

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

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 25 d ago (2026-10-14)

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA	4.0	6.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CNA	4.0	6.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

Siemens .NET Client Library for SIMATIC S7 Webserver API

Classification

Weakness

CWE-209 Generation of Error Message Containing Sensitive Information

References

cert-portal.siemens.com /productcert/html/ssa-390352.html

Sources

CVE List CVE-2026-85115
NVD CVE-2026-85115

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Summary