Siemens SIMATIC IPC BX-21A UEFI Secure Boot risky encryption

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.73-

Summaryinfo

A vulnerability, which was classified as problematic, was found in Siemens SIMATIC IPC BX-21A, SIMATIC IPC RW-543A, SIMATIC IPC227G, SIMATIC IPC277G, SIMATIC IPC277G PRO, SIMATIC IPC327G and SIMATIC IPC377G. This affects an unknown function of the component UEFI Secure Boot. Such manipulation leads to risky encryption. This vulnerability is traded as CVE-2026-72895. An attack has to be approached locally. There is no exploit available.

Detailsinfo

A vulnerability was found in Siemens SIMATIC IPC BX-21A, SIMATIC IPC RW-543A, SIMATIC IPC227G, SIMATIC IPC277G, SIMATIC IPC277G PRO, SIMATIC IPC327G and SIMATIC IPC377G and classified as problematic. Affected by this issue is some unknown functionality of the component UEFI Secure Boot. The manipulation with an unknown input leads to a risky encryption vulnerability. Using CWE to declare the problem leads to CWE-327. The product uses a broken or risky cryptographic algorithm or protocol. Impacted is confidentiality. CVE summarizes:

A vulnerability has been identified in SIMATIC IPC BX-21A (All versions < V31.01.13), SIMATIC IPC RW-543A (All versions < V1.1.4), SIMATIC IPC227G / IPC277G / IPC277G PRO / IPC327G / IPC377G (All versions < V28.01.15). A BIOS vendor test key is present in the UEFI Secure Boot key database. This could allow a local attacker with physical or administrative access to the device to boot an operating system or UEFI application signed with that test key, bypassing UEFI Secure Boot protections even when Secure Boot is enabled, potentially leading to a full loss of confidentiality, integrity, and availability of the device.

The advisory is shared for download at cert-portal.siemens.com. This vulnerability is handled as CVE-2026-72895 since 08/10/2026. The exploitation is known to be difficult. The attack needs to be approached locally. Additional levels of successful authentication are needed for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1600.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

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License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 1.9
VulDB Temp Score: 1.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.7
CNA Vector (siemens): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Risky encryption
CWE: CWE-327 / CWE-310
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

08/10/2026 CVE reserved
10/13/2026 +64 days Advisory disclosed
10/13/2026 +0 days VulDB entry created
10/13/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: siemens.com

Advisory: cert-portal.siemens.com
Status: Confirmed

CVE: CVE-2026-72895 (🔒)
GCVE (CVE): GCVE-0-2026-72895
GCVE (VulDB): GCVE-100-417524

Entryinfo

Created: 10/13/2026 12:06
Changes: 10/13/2026 12:06 (73)
Complete: 🔍
Cache ID: 216::103

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