CVE-2021-31891Network attack vector

Root code execution via crafted HTTP GET

Published Sep 14, 2021 · Updated Aug 3, 2024

OS command injection in Siemens Siveillance OIS across five building-management products allows remote attackers to execute code as root. A request handler fails to neutralize special elements in a specific HTTP GET request before passing attacker-controlled data to an operating-system command. No authentication or user interaction is required, and successful exploitation executes attacker-supplied code with root privileges.

CVSS severity10.0
Critical
EPSS probability3.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Siemens Siveillance OIS across five building-management products allows remote attackers to execute code as root. A request handler fails to neutralize special elements in a specific HTTP GET request before passing attacker-controlled data to an operating-system command. No authentication or user interaction is required, and successful exploitation executes attacker-supplied code with root privileges.

The record

CVE
CVE-2021-31891
Published
Sep 14, 2021
Updated
Aug 3, 2024
Vendor
Siemens
Product
Desigo CC
Classifications
CWE-78, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 with OIS Extension Module

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Desigo CCversion=All versions with OIS Extension Module
Siemens AG · Siveillance Controlversion=All versions with OIS running on Debian 9 or earlier
Siemens AG · Operation Schedulerversion=All versions with OIS running on Debian 9 or earlier
Siemens AG · GMA-Managerversion=All versions with OIS running on Debian 9 or earlier
Siemens AG · Siveillance Control Proversion=All versions

Published CVSS scores

10.0Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application

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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