Siemens SIMATIC S7-1500 TM MFP BIOS Use After Free (CVE-2021-42386)

high Tenable OT Security Plugin ID 502945

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A use-after-free in awk leads to denial of service and possibly code execution when processing a crafted awk pattern in the nvalloc function.

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: High

ID: 502945

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 2/25/2025

Updated: 2/26/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 4.8

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

CVSS Score Source: CVE-2021-42386

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_m804pb_firmware:7.2, cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_a%29_firmware:7.2, cpe:/o:siemens:scalance_m874-3_firmware:7.2, cpe:/o:siemens:scalance_m876-4_%28nam%29_firmware:7.2, cpe:/o:siemens:scalance_s615_eec_firmware:7.2, cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:2.0, cpe:/o:siemens:scalance_wum763-1_firmware:2.0, cpe:/o:siemens:scalance_wum766-1_%28eu%29_firmware:2.0, cpe:/o:siemens:scalance_m876-3_%28evdo%29_firmware:7.2, cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:2.0, 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_wam766-1_%28eu%29_firmware:2.0, cpe:/o:siemens:scalance_mum856-1_%28row%29_firmware:7.2, cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_b%29_firmware:7.2, cpe:/o:siemens:scalance_mum853-1_%28eu%29_firmware:7.2, cpe:/o:siemens:scalance_m874-2_firmware:7.2, cpe:/o:siemens:simatic_s7-1500_tm_mfp, 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_wum766-1_%28us%29_firmware:2.0, 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:scalance_m876-4_firmware:7.2, cpe:/o:siemens:scalance_m876-3_%28rok%29_firmware:7.2, cpe:/o:siemens:scalance_wam766-1_eec_%28eu%29_firmware:2.0, cpe:/o:siemens:scalance_wam763-1_firmware:2.0

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-2021-42386

CWE: 416

ICSA: 23-166-10

Detections

Analytics