CVE-2023-48431Network attack vector

Service crash via malformed UMC server response

Published Dec 12, 2023 · Updated Aug 2, 2024

Improper response validation in Siemens SINEC INS before 1.0 SP2 Update 2 allows remote attackers to crash the service via a UMC server. The UMC integration accepts a response from the configured UMC server without correctly validating exceptional or malformed response conditions. Exploitation requires control of a configured malicious UMC server or manipulation of a legitimate server's traffic; the reported consequence is a service crash.

CVSS severity6.8
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper response validation in Siemens SINEC INS before 1.0 SP2 Update 2 allows remote attackers to crash the service via a UMC server. The UMC integration accepts a response from the configured UMC server without correctly validating exceptional or malformed response conditions. Exploitation requires control of a configured malicious UMC server or manipulation of a legitimate server's traffic; the reported consequence is a service crash.

The record

CVE
CVE-2023-48431
Published
Dec 12, 2023
Updated
Aug 2, 2024
Vendor
Siemens
Product
SINEC INS
Classifications
CWE-754, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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 < V1.0 SP2 Update 2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SINEC INSversion=All versions < V1.0 SP2 Update 2

Published CVSS scores

6.8Siemens AGCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
8.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499Endpoint Denial 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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