CVE-2023-5909· NVD / CVE Program· CNA icscert

Improper Validation of Certificate with Host Mismatch in PTC KEPServerEx

Noroxi assessment

Priority: Monitor (action score 30/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.43% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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

HighCVSS 7.5 · v3.1—No exploit No fix recorded

BDU:2023-08729

Published: Nov 30, 2023
Updated: Jun 17, 2026
EPSS: 0.4% · 36th percentile
CWE: CWE-297

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.5
CNA · icscert: 7.5; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
ge	industrial gateway server	cpe:2.3:a:ge:industrial_gateway_server
ptc	keepserverex	cpe:2.3:a:ptc:keepserverex
ptc	opc-aggregator	cpe:2.3:a:ptc:opc-aggregator
ptc	thingworx industrial connectivity	cpe:2.3:a:ptc:thingworx_industrial_connectivity
ptc	thingworx kepware edge	cpe:2.3:a:ptc:thingworx_kepware_edge
ptc	thingworx kepware server	cpe:2.3:a:ptc:thingworx_kepware_server
rockwellautomation	kepserver enterprise	cpe:2.3:a:rockwellautomation:kepserver_enterprise
softwaretoolbox	top server	cpe:2.3:a:softwaretoolbox:top_server

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

ge industrial gateway serverup to 7.614 inclusive
ptc keepserverexup to 6.14.263.0 inclusive
ptc opc-aggregatorup to 6.14 inclusive
ptc thingworx industrial connectivityall versions
ptc thingworx kepware edgeup to 1.7 inclusive
ptc thingworx kepware serverup to 6.14.263.0 inclusive
rockwellautomation kepserver enterpriseup to 6.14.263.0 inclusive
softwaretoolbox top serverup to 6.14.263.0 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (icscert). Independent of NVD's CPE analysis and usually ahead of it.

GE Gigital Industrial Gateway Server
- up to and including 7.614affected
PTC KEPServerEX
- up to and including 6.14.263.0affected
PTC OPC-Aggregator
- up to and including 6.14affected
PTC ThingWorx Industrial Connectivity
- All versionsaffected
PTC ThingWorx Kepware Edge
- up to and including 1.7affected
PTC ThingWorx Kepware Server
- up to and including 6.14.263.0affected
Rockwell Automation KEPServer Enterprise
- up to and including 6.14.263.0affected
Software Toolbox TOP Server
- up to and including 6.14.263.0affected

Same product

ge: all records

Other highest-scoring records for the same primary product.

CVE-2020-27265KEPServerEX: v6.0 to v6.9, ThingWorx Kepware Server: v6.8 and v6.9, ThingWorx Industrial Connectivity: All versions, OPC-Aggregator: All ver
42Plan
CVE-2022-2825This vulnerability allows remote attackers to execute arbitrary code on affected installations of Kepware KEPServerEX 6.11.718.0.
40Plan
CVE-2020-27267KEPServerEX v6.0 to v6.9, ThingWorx Kepware Server v6.8 and v6.9, ThingWorx Industrial Connectivity (all versions), OPC-Aggregator (all vers
38Monitor
CVE-2020-27263KEPServerEX: v6.0 to v6.9, ThingWorx Kepware Server: v6.8 and v6.9, ThingWorx Industrial Connectivity: All versions, OPC-Aggregator: All ver
38Monitor
CVE-2022-2848This vulnerability allows remote attackers to execute arbitrary code on affected installations of Kepware KEPServerEX 6.11.718.0.
37Monitor
CVE-2023-5908Heap Based Buffer Overflow in PTC KEPServerEx
36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Shawn Hoffmanfinder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: none
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: None

Weakness class (CWE)

CWE-297 · Improper Validation of Certificate with Host Mismatch

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

www.cisa.gov/news-events/ics-advisories/icsa-23-334-03

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records