Siemens SENTRON 7KT PAC1261 HTTP Request/Response Smuggling (CVE-2025-22871)

critical Tenable OT Security Plugin ID 505538

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The Go net/http package incorrectly treats a bare line feed (LF) as a valid line terminator in chunked transfer data. This flaw can permit request smuggling if a net/http server is used in conjunction with a server that incorrectly accepts a bare LF as a line terminator.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Upgrade SENTRON 7KT PAC1261 Data Manager to V2.1.0 or later.

Plugin Details

Severity: Critical

ID: 505538

File Name: tenable_ot_siemens_CVE-2025-22871.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 7/6/2026

Updated: 7/6/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.59

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vulnerability Information

CPE: cpe:/o:siemens:sentron_pac1261_firmware

Required KB Items: Tenable.ot/Siemens

Patch Publication Date: 5/12/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2025-22871

CWE: 444

ICSA: 26-134-14

Detections

Analytics