CVE-2023-28831Network attack vector

Service hang via certificate-validation integer overflow

Published Sep 12, 2023 · Updated Nov 11, 2025

Integer overflow in Siemens OPC UA implementations allows remote attackers to hang affected applications with a crafted certificate. During certificate validation, ANSI C and C++ code mishandles an integer calculation and enters an infinite loop instead of rejecting the malformed certificate. No authentication or user interaction is required; the documented consequence is loss of availability, not data disclosure or modification.

CVSS severity8.7
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Siemens OPC UA implementations allows remote attackers to hang affected applications with a crafted certificate. During certificate validation, ANSI C and C++ code mishandles an integer calculation and enters an infinite loop instead of rejecting the malformed certificate. No authentication or user interaction is required; the documented consequence is loss of availability, not data disclosure or modification.

The record

CVE
CVE-2023-28831
Published
Sep 12, 2023
Updated
Nov 11, 2025
Vendor
Siemens
Product
SIMATIC S7-1500 CPU 1518T-4 PN/DP
Classifications
CWE-190, T1499, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <V3.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC S7-1500 CPU 1518T-4 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1515T-2 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC S7-1500 ET 200pro: CPU 1516PRO F-2 PNversion=0 <V2.9.7
Siemens · SIMATIC SISTARversion=0 <V8.1 SP1
Siemens · SIPLUS ET 200SP CPU 1510SP-1 PN RAILversion=0 <V2.9.7
Siemens · SIMATIC Cloud Connect 7 CC716version=0 <V2.2
Siemens · SIMATIC ET 200SP CPU 1514SP F-2 PNversion=0 <V3.0.3
Siemens · SIPLUS ET 200SP CPU 1510SP F-1 PN RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1517F-3 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC S7-1500 ET 200pro: CPU 1513PRO F-2 PNversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU S7-1518-4 PN/DP ODKversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1517TF-3 PN/DPversion=0 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1516F-3 PN/DP RAILversion=0 <V2.9.7
Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DP MFPversion=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1516-3 PN/DPversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1516-3 PN/DP RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1518TF-4 PN/DPversion=0 <V3.0.3
Siemens · SIPLUS ET 200SP CPU 1510SP F-1 PNversion=0 <V2.9.7
Siemens · SIMATIC WinCC OAversion=0 <V3.17 P029; version=0 <V3.18 P019
Siemens · SIMATIC ET 200SP Open Controller CPU 1515SP PC2version=0 <V21.9.7; version=V30.0.0 <V30.1.0
Siemens · SIMATIC S7-1500 CPU 1511F-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC WinCCversion=0 <*; version=0 <V7.5 SP2 Update 20; version=0 <V8.0 Update 5
Siemens · SIPLUS S7-1500 CPU 1518F-4 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC WinCC Open Architectureversion=0 <V3.19 P005
Siemens · SIMATIC S7-1500 CPU 1511TF-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC WinCC Unified OPC UA Serverversion=0 <V5.0.0.0
Siemens · SIMATIC ET 200SP CPU 1514SPT-2 PNversion=0 <V3.0.3
Siemens · SIPLUS ET 200SP CPU 1512SP F-1 PN RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1513-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC Drive Controller CPU 1507D TFversion=0 <V2.9.7; version=V3.0.1 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1516F-3 PN/DPversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC S7-1500 ET 200pro: CPU 1513PRO-2 PNversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU S7-1518F-4 PN/DP ODKversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1511T-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SINUMERIK MCversion=0 <V1.22
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPversion=0 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1511-1 PN T1 RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1511-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1511F-1 PNversion=0 <V2.9.7
Siemens · SIPLUS ET 200SP CPU 1512SP-1 PNversion=0 <V2.9.7
Siemens · SIMATIC S7-PLCSIM Advancedversion=0 <V5.0 Update 2
Siemens · SIPLUS S7-1500 CPU 1511-1 PN TX RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 Software Controllerversion=0 <V21.9.7; version=0 <V30.1.0
Siemens · SIPLUS S7-1500 CPU 1515F-2 PNversion=0 <V2.9.7
Siemens · SIPLUS S7-1500 CPU 1518-4 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC ET 200SP CPU 1510SP F-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1513F-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC BRAUMATversion=0 <V8.1 SP1
Siemens · SIMATIC S7-1500 CPU 1516T-3 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC Comfort/Mobile RTversion=0 <*
Siemens · SIPLUS S7-1500 CPU 1513-1 PNversion=0 <V2.9.7
Siemens · SIPLUS S7-1500 CPU 1516F-3 PN/DPversion=0 <V2.9.7
Siemens · SIPLUS S7-1500 CPU 1513F-1 PNversion=0 <V2.9.7
Siemens · SIMATIC ET 200SP CPU 1512SP F-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1516-3 PN/DPversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1518F-4 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1512C-1 PNversion=0 <V2.9.7
Siemens · SIMATIC IPC DiagMonitorversion=0 <*
Siemens · SINUMERIK ONEversion=0 <V6.22
Siemens · SIPLUS S7-1500 CPU 1511-1 PNversion=0 <V2.9.7
Siemens · SIMATIC PCS 7version=0 <V9.1 SP2 UC08
Siemens · SIMATIC S7-1500 CPU 1515F-2 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC ET 200SP CPU 1512SP-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIPLUS ET 200SP CPU 1512SP-1 PN RAILversion=0 <V2.9.7
Siemens · SIMATIC WinCC Runtime Professionalversion=0 <*; version=0 <V19 Update 2
Siemens · SIMATIC Drive Controller CPU 1504D TFversion=0 <V2.9.7; version=V3.0.1 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1516-3 PN/DP TX RAILversion=0 <V2.9.7
Siemens · SIPLUS ET 200SP CPU 1510SP-1 PNversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1517T-3 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1511C-1 PNversion=0 <V2.9.7
Siemens · SIMATIC ET 200SP CPU 1514SPT F-2 PNversion=0 <V3.0.3
Siemens · SIMATIC ET 200SP CPU 1514SP-2 PNversion=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1515-2 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIPLUS S7-1500 CPU 1515F-2 PN RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1518-4 PN/DP MFPversion=0 <V3.0.3
Siemens · SIMATIC Cloud Connect 7 CC712version=0 <V2.2
Siemens · SIPLUS S7-1500 CPU 1515F-2 PN T2 RAILversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1515TF-2 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIMATIC S7-1500 CPU 1516TF-3 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC WinCC OPC UA Clientversion=0 <V2.0.0.1
Siemens · SIMATIC S7-1500 ET 200pro: CPU 1516PRO-2 PNversion=0 <V2.9.7
Siemens · SIMATIC S7-1500 CPU 1517-3 PN/DPversion=0 <V3.0.3
Siemens · SIMATIC PCS neoversion=0 <*
Siemens · SIMATIC ET 200SP CPU 1510SP-1 PNversion=0 <V2.9.7; version=0 <V3.0.3
Siemens · SIPLUS ET 200SP CPU 1512SP F-1 PNversion=0 <V2.9.7
Siemens · SIMATIC NET PC Softwareversion=0 <*; version=0 <V16 Update 8; version=0 <V17 SP1 Update 1; version=0 <V18 Update 1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Siemens AGCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service
T0814Denial of Service

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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