CVE-2023-6448: in the CISA KEV catalogue
Unitronics Vision PLC and HMI Insecure Default Password Vulnerability. CISA added CVE-2023-6448 to the Known Exploited Vulnerabilities catalogue on 2023-12-11 with a default due date of 2023-12-18. Known ransomware campaign use: Unknown. Forensic triage flag: No.
Unitronics Vision Series PLCs and HMIs ship with an insecure default password, which if left unchanged, can allow attackers to execute remote commands. (CISA description)
- Vendor / product
- Unitronics Vision PLC and HMI
- CWE
- CWE-1188
- CISA required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS
- 2.1%, percentile 81 (scored 2026-11-03)
EPSS puts about 2.1 in 100 odds (2.1%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 81% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2023-6448 in the CISA KEV catalogue?
Yes. CISA added CVE-2023-6448 (Unitronics Vision PLC and HMI Insecure Default Password Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-12-11. CISA's default due date for it is 2023-12-18.
Is CVE-2023-6448 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2023-6448. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2023-6448?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2023-6448