Siemens SIPROTEC Inadequate Encryption Strength (CVE-2024-38867)

medium Tenable OT Security Plugin ID 504449

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The affected devices are supporting weak ciphers on several ports (443/tcp for web, 4443/tcp for DIGSI 5 and configurable port for syslog over TLS). This could allow an unauthorized attacker in a man-in-the-middle position to decrypt any data passed over to and from those ports.

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 released new versions for several affected products and recommends updating to the latest versions. Siemens is preparing further fix versions and recommends specific countermeasures for products where fixes are not, or not yet available:

- SIPROTEC 5 7SJ81 (CP100), SIPROTEC 5 7SJ82 (CP100): Update to V8.89 or later version
- SIPROTEC 5 7SK82 (CP100): Update to V8.89 or later version
- SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1): Update to V8.89 or later version
- SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1), SIPROTEC 5 Communication Module ETH-BD-2FO: Update to V9.62 or later version
- SIPROTEC 5 Compact 7SX800 (CP050): Update to V9.64 or later version
- SIPROTEC 5 6MD84 (CP300), SIPROTEC 5 6MD85 (CP300), SIPROTEC 5 6MD86 (CP300), SIPROTEC 5 6MD89 (CP300), SIPROTEC 5 6MU85 (CP300), SIPROTEC 5 7KE85 (CP300), SIPROTEC 5 7SS85 (CP300), SIPROTEC 5 7ST85 (CP300), SIPROTEC 5 7ST86 (CP300), SIPROTEC 5 7UM85 (CP300), SIPROTEC 5 7VE85 (CP300), SIPROTEC 5 7VU85 (CP300): Update to V9.64 or later version
- SIPROTEC 5 7SA82 (CP150), SIPROTEC 5 7SD82 (CP150), SIPROTEC 5 7SJ81 (CP150), SIPROTEC 5 7SJ82 (CP150), SIPROTEC 5 7SK82 (CP150), SIPROTEC 5 7SL82 (CP150), SIPROTEC 5 7SX82 (CP150), SIPROTEC 5 7UT82 (CP150), SIPROTEC 5 7SA86 (CP300), SIPROTEC 5 7SA87 (CP300), SIPROTEC 5 7SD86 (CP300), SIPROTEC 5 7SD87 (CP300), SIPROTEC 5 7SJ85 (CP300), SIPROTEC 5 7SJ86 (CP300), SIPROTEC 5 7SK85 (CP300), SIPROTEC 5 7SL86 (CP300), SIPROTEC 5 7SL87 (CP300), SIPROTEC 5 7SX85 (CP300), SIPROTEC 5 7UT85 (CP300), SIPROTEC 5 7UT86 (CP300), SIPROTEC 5 7UT87 (CP300), SIPROTEC 5 7VK87 (CP300): Update to V9.65 or later version
- SIPROTEC 5 6MD85 (CP200), SIPROTEC 5 6MD86 (CP200), SIPROTEC 5 7KE85 (CP200), SIPROTEC 5 7SA84 (CP200), SIPROTEC 5 7SA86 (CP200), SIPROTEC 5 7SA87 (CP200), SIPROTEC 5 7SD84 (CP200), SIPROTEC 5 7SD86 (CP200), SIPROTEC 5 7SD87 (CP200), SIPROTEC 5 7SJ85 (CP200), SIPROTEC 5 7SJ86 (CP200), SIPROTEC 5 7SK85 (CP200), SIPROTEC 5 7SL86 (CP200), SIPROTEC 5 7SL87 (CP200), SIPROTEC 5 7SS85 (CP200), SIPROTEC 5 7ST85 (CP200), SIPROTEC 5 7UT85 (CP200), SIPROTEC 5 7UT86 (CP200), SIPROTEC 5 7UT87 (CP200), SIPROTEC 5 7VK87 (CP200), SIPROTEC 5 Communication Module ETH-BA-2EL (Rev.1), SIPROTEC 5 Communication Module ETH-BB-2FO (Rev. 1): Currently no fix is planned
- SIPROTEC 5 7SA82 (CP100), SIPROTEC 5 7SD82 (CP100), SIPROTEC 5 7SL82 (CP100), SIPROTEC 5 7UT82 (CP100): Currently no fix is available

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

- Restrict access to port 443/tcp for web, 4443/tcp for DIGSI 5 and configurable port for syslog over TLS to trusted IP addresses only

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-750499 in HTML and CSAF.

Plugin Details

Severity: Medium

ID: 504449

File Name: tenable_ot_siemens_CVE-2024-38867.nasl

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 11/18/2025

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v3

Risk Factor: Medium

Base Score: 5.9

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

Vulnerability Information

CPE: cpe:/o:siemens:siprotec_5_7st85_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7st86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sl87_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_6md85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sd82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sd86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md86_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sx82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sa87_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sj82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7vk87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7vk87_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sj82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7ut85_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7ke85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7um85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd87_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sd86_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sl87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sx85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sa82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7ke85_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7ut82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sl86_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sa82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sa86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ve85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sk82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sk85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_compact_7sx800_%28cp050%29_firmware, cpe:/o:siemens:siprotec_5_7sd84_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_6md85_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sk82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sj81_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sj85_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_6md86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7vu85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut86_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7ut82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7ut86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6mu85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7st85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut87_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sj81_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sk85_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sa86_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7sa87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sa84_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7ss85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md84_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md89_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj86_%28cp200%29_firmware, cpe:/o:siemens:siprotec_5_7ut87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ss85_%28cp200%29_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 7/9/2024

Vulnerability Publication Date: 7/9/2024

Reference Information

CVE: CVE-2024-38867

CWE: 326

Detections

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