Skip to content
Fencer Vulns
high 7.5

CVE-2023-5909 json

Improper Validation of Certificate with Host Mismatch in PTC KEPServerEx

published 2023-11-30 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58182

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-23-334-03 updated cvss 7.5

PTC KEPServerEx

  • PTC GE Digital Industrial Gateway Server <=v7.614
    affected: mitigation “PTC has released and recommends users to update to the following versions:” ptc.com
  • PTC KEPServerEX <=v6.14.263.0 PTC OPC-Aggregator <=v6.14
    affected: fixed in v6.15, mitigation “PTC has released and recommends users to update to the following versions:” ptc.com
  • PTC Rockwell Automation KEPServer Enterprise <=v6.14.263.0 PTC Software Toolbox TOP Server <=v6.14.263.0
    affected: mitigation “PTC has released and recommends users to update to the following versions:” ptc.com
  • PTC ThingWorx Industrial Connectivity
    affected: vendor fix, mitigation “PTC has released and recommends users to update to the following versions:” ptc.com
  • PTC ThingWorx Kepware Edge <=v1.7
    affected: fixed in v1.8, mitigation “PTC has released and recommends users to update to the following versions:” ptc.com
  • PTC ThingWorx Kepware Server <=v6.14.263.0
    affected: fixed in v6.15, mitigation “PTC has released and recommends users to update to the following versions:” ptc.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • PTC KEPServerEX
  • PTC ThingWorx Kepware Server
  • PTC ThingWorx Industrial Connectivity
  • PTC OPC-Aggregator
  • PTC ThingWorx Kepware Edge
  • Rockwell Automation KEPServer Enterprise
  • GE Gigital Industrial Gateway Server
  • Software Toolbox TOP Server

Classification

Weakness
  • CWE-297 Improper Validation of Certificate with Host Mismatch
  • CWE-295 Improper Certificate Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.