VulnerabilityModified
CVE-2023-5909
KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.
HIGH 7.5EPSS 0.44%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
KEPServerEX does not properly validate certificates from clients which may allow unauthenticated users to connect.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.44% probability · 38th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-297, CWE-295
- Affected
- ge/industrial gateway server · ptc/keepserverex · ptc/opc-aggregator · ptc/thingworx industrial connectivity · ptc/thingworx kepware edge · ptc/thingworx kepware server · rockwellautomation/kepserver enterprise · softwaretoolbox/top server
- Source
- ics-cert@hq.dhs.gov
EPSS 0.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03Third Party Advisory, US Government Resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-334-03Third Party Advisory, US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.