CVE-2023-40727

Application code tampering via weak signature verification

Published Sep 12, 2023 · Updated Feb 27, 2025

Improper signature verification in Siemens IBS QMS Automotive before 12.39 allows local users to tamper with QMS.Mobile code. QMS.Mobile relies on a weak, outdated application-signing mechanism rather than adequately verifying code authenticity. Low-privileged local access is required, and the disclosed consequence is unauthorized modification of application code.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper signature verification in Siemens IBS QMS Automotive before 12.39 allows local users to tamper with QMS.Mobile code. QMS.Mobile relies on a weak, outdated application-signing mechanism rather than adequately verifying code authenticity. Low-privileged local access is required, and the disclosed consequence is unauthorized modification of application code.

The record

CVE
CVE-2023-40727
Published
Sep 12, 2023
Updated
Feb 27, 2025
Vendor
Siemens
Product
IBS QMS Automotive
Classifications
CWE-347, T1554
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2025Record 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=All versions < V12.39

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · IBS QMS Automotiveversion=All versions < V12.39

Published CVSS scores

7.8Siemens AGCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1554Compromise Host Software Binary

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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