CVE-2024-56182

BIOS password bypass via unprotected EFI variables

Published Mar 11, 2025 · Updated Sep 8, 2026

Protection mechanism failure in Siemens SIMATIC industrial computers allows local users with administrator access to disable the BIOS password. Firmware insufficiently protects EFI variables from direct writes through the flash controller, permitting the password state to be cleared without BIOS authorization. Root or administrator operating-system access is required; exploitation removes the firmware password barrier and exposes protected BIOS settings.

CVSS severity8.2
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Protection mechanism failure in Siemens SIMATIC industrial computers allows local users with administrator access to disable the BIOS password. Firmware insufficiently protects EFI variables from direct writes through the flash controller, permitting the password state to be cleared without BIOS authorization. Root or administrator operating-system access is required; exploitation removes the firmware password barrier and exposes protected BIOS settings.

The record

CVE
CVE-2024-56182
Published
Mar 11, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIMATIC IPC477E PRO
Classifications
CWE-693, T1562
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V21.01.21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Siemens · SIMATIC IPC477E PROversion=0 <V21.01.21
Siemens · SIMATIC IPC RW-543Bversion=0 <V35.02.10
Siemens · SIMATIC IPC PX-39Aversion=0 <V29.01.07
Siemens · SIMATIC IPC277Eversion=0 <*
Siemens · SIMATIC IPC847Eversion=0 <V25.02.15
Siemens · SIMATIC Field PG M5version=0 <*
Siemens · SIMATIC IPC377Gversion=0 <V28.01.14
Siemens · SIMATIC IPC627Eversion=0 <V25.02.15
Siemens · SIMATIC IPC277Gversion=0 <V28.01.14
Siemens · SIMATIC IPC227E Industrial Edge Deviceversion=0 <*
Siemens · SIMATIC ITP1000version=0 <*
Siemens · SIMATIC IPC677Eversion=0 <V25.02.15
Siemens · SIMATIC IPC127E Industrial Edge Deviceversion=0 <V27.01.11
Siemens · SIMATIC IPC RC-543Bversion=0 <V35.01.12
Siemens · SIMATIC IPC427E Industrial Edge Deviceversion=0 <V21.01.21
Siemens · SIMATIC IPC BX-59Aversion=0 <V32.01.04
Siemens · SIMATIC IPC347Gversion=0 <*
Siemens · SIMATIC IPC477Eversion=0 <V21.01.21
Siemens · SIMATIC IPC277G PROversion=0 <V28.01.14
Siemens · SIMATIC IPC527Gversion=0 <*
Siemens · SIMATIC IPC3000 SMART V3version=0 <*
Siemens · SIMATIC IPC RW-543Aversion=0 <V1.1.4
Siemens · SIMATIC IPC PX-32Aversion=0 <V29.01.07
Siemens · SIMATIC IPC BX-32Aversion=0 <V29.01.07
Siemens · SIMATIC IPC BX-21Aversion=0 <V31.01.07
Siemens · SIMATIC IPC227G Industrial Edge Deviceversion=0 <V28.01.14
Siemens · SIMATIC IPC BX-39Aversion=0 <V29.01.07
Siemens · SIMATIC IPC327Gversion=0 <V28.01.14
Siemens · SIMATIC IPC647Eversion=0 <V25.02.15
Siemens · SIMATIC Field PG M6version=0 <V26.01.12
Siemens · SIMATIC IPC PX-39A PROversion=0 <V29.01.07
Siemens · SIMATIC IPC RC-543Aversion=0 <V36.01.03

Published CVSS scores

8.4Siemens ProductCERTCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H
8.2Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1562Impair Defenses

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo