No exploitation reportedFix available

CVE-2017-9938

No exploitation reported by the sources we read.

Published2017-08-08
WeaknessCWE-20 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2017-08-0800:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-9938?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-9938?format=csv
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Versions per branch

NVD

Siemens simatic logon

Branch	Affected	Fixed in	Source
1.5	≤ 1.5	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-17-192-01 CISA1 known affected
Siemens SIMATIC Logon
SIMATIC Logon: All versions prior to V1.6

Full record on NVD

Fix

Vendor fix CISA ICSA-17-192-01 · 1 productSiemens created a software upgrade V1.6 for SIMATIC Logon which fixes the vulnerability, and they recommend users upgrade to the newest version. Please contact the local Siemens representative or customer support at the following location:
Vendor fix CISA ICSA-17-192-01 · 1 producthttps://www.siemens.de/automation/partner
Vendor fix CISA ICSA-17-192-01 · 1 productSiemens strongly recommends users protect network access to the Port 16389/TCP of the SIMATIC Logon Remote Access service with appropriate mechanisms. Siemens also advises that users configure the operational environment according to Siemens ' Operational Guidelines for Industrial Security:
Vendor fix CISA ICSA-17-192-01 · 1 producthttps://www.siemens.com/cert/operational-guidelines-industrial-security
Vendor fix CISA ICSA-17-192-01 · 1 productFor a more specific list of affected products and more detailed mitigation instructions, please see Siemens Security Advisory SSA-804859 at the following location:
Vendor fix CISA ICSA-17-192-01 · 1 producthttp://www.siemens.com/cert/advisories

Advisories and patches

www.siemens.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
CNAweakness (CWE)CWE-787read 2026-10-23
NVDweakness (CWE)CWE-20read 2026-10-23
FIRST EPSSEPSS score2.9 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-08-08
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-9938?

Is CVE-2017-9938 actively exploited?

Active exploitation of CVE-2017-9938 has not been confirmed. Its EPSS score was 2.9% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-9938?

CVE-2017-9938 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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