A vulnerability was discovered in Siemens SIMATIC Logon (All versions before V1.6) that could allow specially crafted packets sent to the S…

Published 9 y ago 2017-08-08 · modified 4 mo ago 2026-06-17 · JSON

CVSS

7.5

v3.0 · NVD

CISA KEV

not known exploited

EPSS

2.9%

percentile 87%

Public exploits

none known

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.

Exploit prediction (EPSS)

2.90% probability of exploitation in the next 30 days, higher than 87% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
NVD	3.0	7.5	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
NVD	2.0	5.0	`AV:N/AC:L/Au:N/C:N/I:N/A:P`

Affected products

n/a SIMATIC Logon All versions before V1.6

Classification

Weakness

CWE-787 Out-of-bounds Write
CWE-20 Improper Input Validation

References

securityfocus.com /bid/99539 · vdb-entry, x_refsource_BID, x_transferred
tenable.com /security/research/tra-2017-34 · x_refsource_MISC, x_transferred
siemens.com /cert/pool/cert/siemens_security_advisory_ssa-804859.pdf · x_refsource_CONFIRM, x_transferred

Sources

CVE List: CVE-2017-9938
NVD: CVE-2017-9938

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary