Siemens SCALANCE, Ruggedcom ROX Integer Underflow (Wrap or Wraparound) (CVE-2022-2639)

high Tenable OT Security Plugin ID 504920

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An integer coercion error was found in the openvswitch kernel module.
Given a sufficiently large number of actions, while copying and reserving memory for a new action of a new flow, the reserve_sfa_size() function does not return -EMSGSIZE as expected, potentially leading to an out-of-bounds write access. This flaw allows a local user to crash or potentially escalate their privileges on the system.

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

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:

- Update all of the affected products to v7.2 or later version or the software.

As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens' operational guidelines for Industrial Security, and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found on the Siemens page for Industrial Security.

For further inquiries on security vulnerabilities in Siemens products and solutions, contact the Siemens ProductCERT.

For more information, see the associated Siemens security advisory SSA-419740 in HTML and CSAF.

Plugin Details

Severity: High

ID: 504920

File Name: tenable_ot_siemens_CVE-2022-2639.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 1/9/2026

Updated: 2/17/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: High

Score: 8.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2022-2639

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_m804pb_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1400_firmware, cpe:/o:siemens:ruggedcom_rox_rx5000_firmware, cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_a%29_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1500_firmware, cpe:/o:siemens:scalance_m874-3_firmware:7.2, cpe:/o:siemens:scalance_m876-4_%28nam%29_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1536_firmware, cpe:/o:siemens:ruggedcom_rox_rx1524_firmware, cpe:/o:siemens:scalance_s615_eec_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1510_firmware, cpe:/o:siemens:scalance_m876-3_%28evdo%29_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1512_firmware, cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_b%29_firmware:7.2, cpe:/o:siemens:scalance_s615_firmware:7.2, cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_eu_firmware:7.2, cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_a%29_firmware:7.2, cpe:/o:siemens:scalance_mum856-1_%28row%29_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1511_firmware, cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_b%29_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_rx1501_firmware, cpe:/o:siemens:scalance_mum853-1_%28eu%29_firmware:7.2, cpe:/o:siemens:scalance_m874-2_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_mx5000_firmware, cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_nam_firmware:7.2, cpe:/o:siemens:scalance_m876-4_%28eu%29_firmware:7.2, cpe:/o:siemens:scalance_m826-2_shdsl-router_firmware:7.2, cpe:/o:siemens:scalance_mum856-1_%28eu%29_firmware:7.2, cpe:/o:siemens:ruggedcom_rox_mx5000re_firmware, cpe:/o:siemens:scalance_m876-4_firmware:7.2, cpe:/o:siemens:scalance_m876-3_%28rok%29_firmware:7.2

Required KB Items: Tenable.ot/Siemens

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/14/2023

Vulnerability Publication Date: 3/14/2023

Reference Information

CVE: CVE-2022-2639

CWE: 191

ICSA: 23-075-01

Detections

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