Security Resilience

CVE-2023-28831

Memory Safety in Siemens Simatic S7-1500 Software Controller Firmware ≤ 2.9.7

Memory Safety
Published
12 September 2023
Modified
18 August 2025
Patch / advisory
View advisory
CVSS Score v4 8.7
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.011 66th percentile
Risk Priority 47 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-28831 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Siemens Simatic S7-1500 Software Controller Firmware. Its CVSS base score is 8.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique LSA Secrets (T1003.004); ranked in the top 34% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

The OPC UA implementations (ANSI C and C++) in affected products contain an integer overflow vulnerability that could cause the application to run into an infinite loop during certificate validation. This could allow an unauthenticated remote attacker to create a…

more

denial of service condition by sending a specially crafted certificate.

CWE(s)
CWE-190

Related Threats

MITRE ATT&CK Enterprise Techniques

T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.005 Cached Domain Credentials Credential Access
Adversaries may attempt to access cached domain credentials used to allow authentication to occur in the event a domain controller is unavailable.
attack.mitre.org →
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
attack.mitre.org →
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
T1006 Direct Volume Access Stealth
Adversaries may directly access a volume to bypass file access controls and file system monitoring.
attack.mitre.org →
T1008 Fallback Channels Command And Control
Adversaries may use fallback or alternate communication channels if the primary channel is compromised or inaccessible in order to maintain reliable command and control and to avoid data transfer thresholds.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-46156Same product: Siemens Simatic Drive Controller Cpu 1504D Tf
CVE-2026-25572Same vendor: Siemens
CVE-2025-29931Same vendor: Siemens
CVE-2023-24581Same vendor: Siemens
CVE-2024-32062Same vendor: Siemens
CVE-2024-32057Same vendor: Siemens
CVE-2023-38074Same vendor: Siemens
CVE-2023-37376Same vendor: Siemens
CVE-2025-23402Same vendor: Siemens
CVE-2023-44322Same vendor: Siemens

Affected Assets

siemens
simatic cloud connect 7 cc712 firmware
≤ 2.2
siemens
simatic cloud connect 7 cc716 firmware
≤ 2.2
siemens
simatic drive controller cpu 1504d tf firmware
≤ 2.2
siemens
simatic drive controller cpu 1507d tf firmware
≤ 2.9.7
siemens
simatic et 200sp open controller cpu firmware
≤ 2.9.7
siemens
simatic s7-1200 cpu firmware
≤ 3.0.3
siemens
simatic s7-1500 cpu 1510sp-1 pn firmware
≤ 2.9.7
siemens
simatic s7-1500 cpu 1510sp f-1 pn firmware
≤ 3.0.3
siemens
simatic s7-1500 cpu 1511-1 pn firmware
≤ 21.9.7
siemens
simatic s7-1500 cpu 1511c-1 pn firmware
≤ 30.0.0
+68 more product configuration(s) — see NVD for full list

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)
  • V5.2.6

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 partial match
blocks

Secure SDLC practices directly require use of safe arithmetic, bounds checks, and testing that prevent integer overflows.

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.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

References