CVE-2020-28392

Privilege escalation via insecure default folder permissions

Published Feb 9, 2021 · Updated Aug 4, 2024

Incorrect default permissions in Siemens SIMARIS configuration before 4.0.1 allow local users to gain persistence or elevate privileges. The installer configures the default application folder and its subfolders with permissions that permit lower-privileged modification. Exploitation requires local low-privileged access and later use of the modified installation when a user with elevated credentials logs on.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect default permissions in Siemens SIMARIS configuration before 4.0.1 allow local users to gain persistence or elevate privileges. The installer configures the default application folder and its subfolders with permissions that permit lower-privileged modification. Exploitation requires local low-privileged access and later use of the modified installation when a user with elevated credentials logs on.

The record

CVE
CVE-2020-28392
Published
Feb 9, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
SIMARIS configuration
Classifications
CWE-276, CAPEC-1, T1574.005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 < V4.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMARIS configurationversion=All versions < V4.0.1

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P

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-276Incorrect Default Permissions
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1574.005Hijack Execution Flow: Executable Installer File Permissions Weakness

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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