CVE-2024-28956

Protected-data disclosure via unconstrained indirect branch predictions

Published May 13, 2025 · Updated Sep 8, 2026

Information disclosure in Siemens SIMATIC and SIPLUS S7-1500 MFP V3.1.6 and later allows local users to read protected data. Indirect branch predictions are not fully constrained by eIBRS or IBPB boundaries, permitting attacker-influenced targets to drive transient execution and expose data through microarchitectural side effects. Exploitation requires authenticated code execution on the same controller and affects confidentiality without reported integrity or availability impact.

CVSS severity5.7
Medium
EPSS probability0.41%
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

Information disclosure in Siemens SIMATIC and SIPLUS S7-1500 MFP V3.1.6 and later allows local users to read protected data. Indirect branch predictions are not fully constrained by eIBRS or IBPB boundaries, permitting attacker-influenced targets to drive transient execution and expose data through microarchitectural side effects. Exploitation requires authenticated code execution on the same controller and affects confidentiality without reported integrity or availability impact.

The record

CVE
CVE-2024-28956
Published
May 13, 2025
Updated
Sep 8, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-1421, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 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=V3.1.6 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.6 <*
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.6 <*

Published CVSS scores

5.6Intel CorporationCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
5.7Intel CorporationCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1421Exposure of Sensitive Information in Shared Microarchitectural Structures during Transient Execution
T1005Data from Local System

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