CVE-2017-9938

mediumpriority · track · 31EPSS 0.029 · 87 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.90% (87th) EPSS

CVSS 5 · medium

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

A vulnerability was discovered in Siemens SIMATIC Logon (All versions before V1.6) that could allow specially crafted packets sent to the SIMATIC Logon Remote Access service on port 16389/tcp to cause a Denial-of-Service condition. The service restarts automatically.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSIMATIC Logoncisa_csaf_ot
For a more specific list of affected products and more detailed mitigation instructions, please see Siemens Security Advisory SSA-804859 at the following location:

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · CISA US

v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-787USCWE-787US

affected products (4)

Products and version ranges known to be affected.

SIMATIC Logon: All versions prior to V1.6all versionscisa_csaf_otUS
Siemens SIMATIC Logon< 1.6cisa_csaf_otUS
n/a SIMATIC Logon All versions before V1.6≤ SIMATIC Logon All versions before V1.6enisa_euvdEU
siemens simatic logon≤ 1.5nvdUScpe:2.3:a:siemens:simatic_logon:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-17-192-01Siemens SIMATIC Logon2017-07-11icsa · cisa_csaf_otUS
ATTENTION: Remotely exploitable/low skill level to exploit.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2017-08-08modified 2026-06-17

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references (8)

External citations — patches, advisories, analysis.

scry

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