CVE-2023-46284Network attack vector

Service crash via out-of-bounds request write

Published Dec 12, 2023 · Updated Feb 25, 2026

Out-of-bounds write in Siemens User Management Component allows remote attackers to crash affected applications through TCP requests. The component writes past an allocated buffer while processing specific unauthenticated requests received on TCP ports 4002 and 4004. Successful exploitation interrupts the service, which Siemens states is automatically restarted after the crash.

CVSS severity7.5
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in Siemens User Management Component allows remote attackers to crash affected applications through TCP requests. The component writes past an allocated buffer while processing specific unauthenticated requests received on TCP ports 4002 and 4004. Successful exploitation interrupts the service, which Siemens states is automatically restarted after the crash.

The record

CVE
CVE-2023-46284
Published
Dec 12, 2023
Updated
Feb 25, 2026
Vendor
Siemens
Product
SINEC NMS
Classifications
CWE-120, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record 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 <V2.0 SP1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SINEC NMSversion=0 <V2.0 SP1
Siemens · Totally Integrated Automation Portal (TIA Portal)version=0 <*; version=0 <V17 Update 8; version=0 <V18 Update 3
Siemens · Opcenter Qualityversion=0 <V2312
Siemens · Opcenter Execution Foundationversion=0 <V2407
Siemens · SIMATIC PCS neoversion=0 <V4.1

Published CVSS scores

7.5Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo