CVE-2026-72895

Vulnerability in Siemens SIMATIC IPC BX 21A

CVSS score

7.7

EPSS probability

—

Risk score

0.8

Published

1 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

UEFI Secure Boot Bypass Vulnerability in Siemens SIMATIC IPC Devices

Sources read

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

A vulnerability has been identified in Siemens SIMATIC IPC products due to the presence of a BIOS vendor test key in the UEFI Secure Boot key database, allowing a local attacker to bypass Secure Boot protections.

Why does it matter?

This vulnerability carries the risk of a full loss of confidentiality, integrity, and availability because it allows running unauthorized operating systems or UEFI applications even when Secure Boot is enabled.

What should be done?

Follow the relevant vendor advisory
Apply the provided security updates

Chain of evidence and sources2 verified claims

Siemens SIMATIC IPC cihazlarının UEFI Secure Boot anahtar veritabanında bir BIOS üretici test anahtarı bulunmaktadır.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Zafiyet, cihazın gizlilik, bütünlük ve erişilebilirliğinin tam kaybına yol açabilecek Secure Boot atlatmalarına izin vermektedir.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

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.

CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CWE: CWE-1394

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-72895 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	siemens	SIMATIC IPC BX-21A	View
2	siemens	SIMATIC IPC RW-543A	View
3	siemens	SIMATIC IPC227G / IPC277G / IPC277G PRO / IPC327G / IPC377G	View

Total affected vendors: 1|Products: 3

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.4	CVSS V40	HIGH	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD
8.4	CVSS V4_0	HIGH	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	CVE CNA
7.7	CVSS V31	HIGH	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H	NVD
7.7	CVSS V3_1	HIGH	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-72895 is associated with the following CWEs:

CWE-1394: Common Weakness Enumeration Entry CWE-1394

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-72895 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

UserGerekiyor

Official Sources and Advisories

https://cert-portal.siemens.com/productcert/html/ssa-159454.htmlvendor-advisory

CVSS Vector Radar Chart

7.7 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone required

User Interaction—

Confidentiality (Gizlilik)High

Integrity (Bütünlük)High

Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

siemens

Weakness Type (CWE & CAPEC)

CWE-1394

Similar Vulnerabilities

10.0

CVE-2021-44228 Actively exploited

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