Siemens SCALANCE and RUGGEDCOM Devices Improper Input Validation (CVE-2024-46840)

medium Tenable OT Security Plugin ID 504660

Synopsis

The remote OT asset is affected by a vulnerability.

Description

btrfs: clean up our handling of refs == 0 in snapshot delete. In reada we BUG_ON(refs == 0), which may be problematic because there is no lock on the extent leave, potentially leading to a transient incorrect answer. In walk_down_proc, BUG_ON(refs == 0) is also used, which could occur due to extent tree corruption. This has been changed to return
-EUCLEAN. In do_walk_down() this case is caught and handled correctly, however -EIO is returned, whereas -EUCLEAN would a more appropriate error code. Finally in walk_up_proc, BUG_ON(refs == 0) is also used, it has also been converted to proper error handling.

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

Solution

Refer to the vendor advisory.

Plugin Details

Severity: Medium

ID: 504660

Version: 1.1

Type: remote

Family: Tenable.ot

Published: 11/18/2025

Updated: 11/18/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:siemens:scalance_xc-400_series_firmware, cpe:/o:siemens:scalance_xc-300_series_firmware, cpe:/o:siemens:scalance_xr-300_series_firmware, cpe:/o:siemens:scalance_xr-500wg_series_firmware, cpe:/o:siemens:scalance_xcm-300_series_firmware, cpe:/o:siemens:scalance_xrm-300_series_firmware, cpe:/o:siemens:ruggedcom_rst2428p_firmware:3.2, cpe:/o:siemens:scalance_xrh-300_series_firmware, cpe:/o:siemens:scalance_xr-500_series_firmware, cpe:/o:siemens:scalance_xch-300_series_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 8/12/2025

Vulnerability Publication Date: 8/12/2025

Reference Information

CVE: CVE-2024-46840

CWE: 20

Detections

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