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CVE-2017-9938

24
FAUCET Score

CVE-2017-9938 is a Denial-of-Service vulnerability affecting Siemens SIMATIC Logon versions prior to V1.6. An unauthenticated attacker can exploit this by sending specially crafted packets to the Remote Access service on TCP port 16389, causing the service to restart. This vulnerability has a CVSS v3 score of 7.5 (HIGH), indicating a network-based attack with low complexity and high availability impact, though the service automatically recovers. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.5CPE matchmatch criteria
cpe:2.3:a:siemens:simatic_logon:*:sp3_update_2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.90%
Probability of exploitation in next 30 days
EPSS Percentile
85.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0290 is in the 74th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

bindvendor investigatingvia llm_extracted
kerasvendor investigatingvia llm_extracted
mitelvendor investigatingvia llm_extracted

Vendor Advisories (3)

mitelllm-mitel-d4e4afc104cc9c7dMEDIUM

[R1] Siemens SIMATIC Logon Denial of Service

Nov 20, 2017
kerasllm-keras-b805f1a99b0e85d4MEDIUM

[R1] Siemens SIMATIC Logon Denial of Service

Nov 20, 2017
bindllm-bind-ca605869aa78b3dfMEDIUM

Siemens SIMATIC Logon Denial of Service

Nov 20, 2017

References

siemens.com / cert/pool/cert/siemens_security_advisory_ssa-804859.pdf
Vendor Advisory
tenable.com / security/research/tra-2017-34
securityfocus.com / bid/99539
Third Party AdvisoryVDB Entry