Heap Based Buffer Overflow in PTC KEPServerEx

published 2023-11-30 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58181

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 61%
public exploits: 0; none known

KEPServerEX is vulnerable to a buffer overflow which may allow an attacker to crash the product being accessed or leak information.

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 2023-11-30 cvss 9.1

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

Exploit prediction

0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

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-122 Heap-based Buffer Overflow
CWE-120 Buffer Copy without Checking Size of Input

References

cisa.gov /news-events/ics-advisories/icsa-23-334-03
government-resource, third-party-advisory, us-government-resource

Sources

CVE List CVE-2023-5908
NVD CVE-2023-5908

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.

Summary