---
id: "CVE-2026-127125"
page: "https://infrastack.ai/live/CVE-2026-127125"
kind: "vulnerability"
aliases: ["CVE-2026-127125"]
title: "P-Net: RPC session crash lets adjacent attacker take industrial device offline"
severity: "medium"
cvss: 6.0
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "P-Net", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["embedded", "industrial-control", "p-net", "package", "profinet"]
not_affected_if: ["no-adjacent-network-access", "p-net-1.0.4-or-later"]
published_at: "2026-11-13T14:17:55+00:00"
first_seen_at: "2026-11-13T15:19:49+00:00"
updated_at: "2026-11-13T15:21:28+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-127125", "first_seen_at": "2026-11-13T15:19:49+00:00"}]
exploit_sources: []
---

# P-Net: RPC session crash lets adjacent attacker take industrial device offline

Link for people: https://infrastack.ai/live/CVE-2026-127125 (this .md is for agents)

P-Net is an industrial Profinet device stack; before 1.0.4, a resent unacknowledged response fragment makes it dereference a NULL pointer. An attacker on the same network segment who has seen an established Application Relationship UUID can crash the device.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:P-Net affected range not listed fixed no fixed version listed

## How to check

- Check the P-Net version in the device firmware or build, for example `P-Net` version string in the project.

## Fix

- P-Net: `1.0.4` (fixed version stated in the description)

## Timeline

- 2026-11-13T15:19:49+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-127125

## From the sources

P-Net before 1.0.4 aborts the Application Relationship of an RPC session when a fragment of a response has been resent without being acknowledged, without checking that the session has an Application Relationship. A request for an existing Application Relationship that is sent on another activity than its Connect, and gets a fragmented response, is handled on a session without one. If the response is not acknowledged, a NULL pointer is dereferenced and the device crashes. A conformant IO-controller does not send such requests. The attacker must have observed the AR UUID of an established Application Relationship and requires ADJACENT network access.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_