CVE-2023-5909 | Improper Validation of Certificate with Host Mismatch in PTC KEPServerEx

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

Published: 2023-11-30 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-5909 is rated Moderate Risk (42.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.44%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-5909

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.44% +0.37%
2 2025-03-30 0.16% 0.07% -0.09%
3 2025-03-29 — 0.16% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-5909

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-5909

Affected software / configurations for CVE-2023-5909

Vendor Product Version Raw CPE
ge industrial_gateway_server <= 7.614 cpe:2.3:a:ge:industrial_gateway_server:*:*:*:*:*:*:*:*
ptc keepserverex <= 6.14.263.0 cpe:2.3:a:ptc:keepserverex:*:*:*:*:*:*:*:*
ptc opc-aggregator <= 6.14 cpe:2.3:a:ptc:opc-aggregator:*:*:*:*:*:*:*:*
ptc thingworx_industrial_connectivity — cpe:2.3:a:ptc:thingworx_industrial_connectivity:-:*:*:*:*:*:*:*
ptc thingworx_kepware_edge <= 1.7 cpe:2.3:a:ptc:thingworx_kepware_edge:*:*:*:*:*:*:*:*
ptc thingworx_kepware_server <= 6.14.263.0 cpe:2.3:a:ptc:thingworx_kepware_server:*:*:*:*:*:*:*:*
rockwellautomation kepserver_enterprise <= 6.14.263.0 cpe:2.3:a:rockwellautomation:kepserver_enterprise:*:*:*:*:*:*:*:*
softwaretoolbox top_server <= 6.14.263.0 cpe:2.3:a:softwaretoolbox:top_server:*:*:*:*:*:*:*:*

References for CVE-2023-5909

URL Tags
https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03 Third Party Advisory US Government Resource
cvelogic Threat Intelligence