High severity · published Oct 13, 2026
CVE-2026-85114
A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61)
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads.
This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NC
.NET Client Library for SIMATIC S7 Webserver API · Siemens
before V3.3.61 · source: vendor
In the news
VulnerabilityHigh
Siemens SIMATIC S7 Webserver API
View CSAF
Summary
.NET Client Library for SIMATIC S7 Webserver API contains multiple vulnerabilities that could allow an attacker to obtain sensitive information or write arbitrary files outside the intended download directory. Siemens has released a new version for .NET Client Library for SIMATIC S7 Webserver API and recommends to update to the latest version.
The following versions of Siemens SIMATIC S7 Webserver API are affected:
.NET Client Library for SIMATIC S7 Webserver API vers:intdot/<3.3.61, vers:intdot/<3.3.62 (CVE-2026-85114, CVE-2026-85115)
CVSS
Vendor
Equipment
v3 7.5
Siemens
.NET Client Library for SIMATIC S7 Webserver API
2 Vulnerabilities
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Generation of Error Message Containing Sensitive Information
Background
Critical Infrastructure Sectors: Critical Manufacturing, Transportation Systems, Energy, Healthcare and Public Health, Financial Services, Government Services and Facilities
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
Vulnerabilities
Expand All +
CVE-2026-85114
Affected applications do not properly validate filenames received from remote servers during ticket downloads. This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled,...
Oct 22, 2026·CISA Advisories
Affected product
NC
.NET Client Library for SIMATIC S7 Webserver API
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-85114
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-85114
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-390352.html
More from .NET Client Library for SIMATIC S7 Webserver API
5.5
CVE-2026-85115
A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.62)
