Targets Siemens SIMATIC S7 .NET client used in industrial control systems; arbitrary file write/overwrite can disrupt OT environments across multiple industries.
CVE-2026-85114
Directory traversal in SIMATIC S7 .NET client allows arbitrary file write/overwrite
Is CVE-2026-85114 being exploited?
Not confirmed. CVE-2026-85114 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-85114?
CVE-2026-85114 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-85114?
Yes. A fix has been recorded for CVE-2026-85114. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-85114 affect?
CVE-2026-85114 affects .NET Client Library for SIMATIC S7 Webserver API (< V3.3.61), Applications using the SIMATIC S7 Webserver API. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-85114?
Upgrade to V3.3.61+, restrict network access to webserver, audit replaced files
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Manipulated ticket responses enable arbitrary file write outside download dir and overwrite existing files, enabling tampering, persistence, or service disruption.
Immediate action required
- affected< V3.3.61
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.