Cyber Resilience

CVE-2023-33919

RCE in Siemens Cpci85 Firmware ≤ v05

Public PoCRCECommand Injection
Published
13 June 2023
Modified
03 November 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.2
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.48 99th percentile
Risk Priority 73 floored blend · peak EPSS

Summary

CVE-2023-33919 is a high-severity Command Injection (CWE-77) vulnerability in Siemens Cpci85 Firmware. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 1% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

The vulnerability CVE-2023-33919 is a command injection flaw (CWE-77) in the web interface of Siemens CP-8031 MASTER MODULE and CP-8050 MASTER MODULE devices running firmware versions prior to CPCI85 V05. It stems from missing server-side input sanitization and carries a CVSS 3.1 score of 7.2.

An authenticated attacker with privileged remote access can supply crafted input to the web interface and execute arbitrary commands with root privileges on the affected devices.

Siemens has published advisory SSA-731916 detailing the issue, while public disclosures and proof-of-concept material have appeared on Full Disclosure and Packet Storm. The associated EPSS score reached a peak of 0.1174 before receding to its current value of 0.0985.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

A vulnerability has been identified in CP-8031 MASTER MODULE (All versions < CPCI85 V05), CP-8050 MASTER MODULE (All versions < CPCI85 V05). The web interface of affected devices is vulnerable to command injection due to missing server side input sanitation.…

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This could allow an authenticated privileged remote attacker to execute arbitrary code with root privileges.

CWE(s)
CWE-77

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
T1059.003 Windows Command Shell Execution
Adversaries may abuse the Windows command shell for execution.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-33921Same product: Siemens Cp-8031 Master Module
CVE-2024-39568Same vendor: Siemens
CVE-2023-33920Same product: Siemens Cp-8031 Master Module
CVE-2024-39570Same vendor: Siemens
CVE-2023-36753Same vendor: Siemens
CVE-2024-56837Same vendor: Siemens
CVE-2024-39569Same vendor: Siemens
CVE-2024-56836Same vendor: Siemens
CVE-2023-36754Same vendor: Siemens
CVE-2025-40937Same vendor: Siemens

Affected Assets

siemens
cpci85 firmware
≤ v05 · ≤ v05

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.3
  • V1.2.5
  • V1.2.8
  • V1.2.9

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation and neutralization that prevent command injection.

DE.CM-09 partial match
prevents

Runtime monitoring of software and data can detect anomalous command execution resulting from injection.

ID.RA-01 partial match
prevents

Identifying recorded vulnerabilities enables remediation of command-injection flaws before exploitation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.28 Secure coding mostly match
prevents

Secure coding standards require proper escaping and parameterization of commands, directly eliminating CWE-77.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing in development catches command-injection vulnerabilities before release.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates input validation and command construction practices that directly prevent command injection.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly call for controls against injection flaws including command injection.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles reduce the attack surface but do not prescribe the specific neutralization techniques needed.

A.8.31 Separation of development, test and production environments none match
none

Environment separation limits the blast radius of an exploited command injection but does not prevent the flaw itself.

References