CVE-2024-39874Network attack vector

Credential disclosure via unrestricted authentication attempts

Published Jul 9, 2024 · Updated Aug 27, 2025

Improper brute-force protection in Siemens SINEMA Remote Connect Server before 3.2 SP1 allows remote attackers to learn user credentials. The Client Communication component accepts excessive authentication attempts against user credentials without effective restriction. Network access to that component is sufficient; successful attacks disclose only credentials weak enough to be guessed.

CVSS severity8.7
High
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper brute-force protection in Siemens SINEMA Remote Connect Server before 3.2 SP1 allows remote attackers to learn user credentials. The Client Communication component accepts excessive authentication attempts against user credentials without effective restriction. Network access to that component is sufficient; successful attacks disclose only credentials weak enough to be guessed.

The record

CVE
CVE-2024-39874
Published
Jul 9, 2024
Updated
Aug 27, 2025
Vendor
Siemens
Product
SINEMA Remote Connect Server
Classifications
CWE-307, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2025Record 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=0 <V3.2 SP1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SINEMA Remote Connect Serverversion=0 <V3.2 SP1

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7Siemens ProductCERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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 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-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

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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