CVE-2025-39787

System crash via unbounded ELF header traversal

Published Sep 11, 2025 · Updated Aug 5, 2026

Out-of-bounds read in the Qualcomm MDT loader in affected Linux and Siemens firmware allows local users to crash the system. The loader iterates ELF program and section headers without first bounding the firmware buffer or validating e_phentsize and e_shentsize. Reachability requires local low-privileged access and a client path that passes an unsanitized firmware image to the MDT loader; remoteproc sanitizes its header first.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Qualcomm MDT loader in affected Linux and Siemens firmware allows local users to crash the system. The loader iterates ELF program and section headers without first bounding the firmware buffer or validating e_phentsize and e_shentsize. Reachability requires local low-privileged access and a client path that passes an unsanitized firmware image to the MDT loader; remoteproc sanitizes its header first.

The record

CVE
CVE-2025-39787
Published
Sep 11, 2025
Updated
Aug 5, 2026
Vendor
Siemens
Product
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=V3.1.5 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*
The Linux Kernel Organization · Linuxversion=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <0d59ce2bfc3bb13abe6240335a1bf7b96536d022; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <1096eb63ecfc8df90b70cd068e6de0c2ff204dfd; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <43d26997d88c4056fce0324e72f62556bc7e8e8d; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <81278be4eb5f08ba2c68c3055893e61cc03727fe; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <87bfabb3b2f46827639173f143aa43f7cfc0a7e6; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <981c845f29838e468a9bfa87f784307193a31297; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <9f9967fed9d066ed3dae9372b45ffa4f6fccfeef; version=2aad40d911eeb7dcac91c669f2762a28134f0eb1 <e1720eb32acf411c328af6a8c8f556c94535808e; version=4.11
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=V3.1.5 <*
Siemens · SIMATIC CN 4100version=0 <V5.0
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=V3.1.5 <*

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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

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Your stack

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