Known exploited · Unitronics
CVE-2023-6448: Unitronics Vision PLC and HMI Insecure Default Password Vulnerability
What it is
Unitronics Vision Series PLCs and HMIs ship with an insecure default password, which if left unchanged, can allow attackers to execute remote commands.
- Vendor
- Unitronics
- Product
- Vision PLC and HMI
- Added to KEV
- December 11, 2023
- CISA due date
- December 18, 2023
- Ransomware use
- Unknown
What CISA requires
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Forensic triage
No
What to do now
- Find every instance of Vision PLC and HMI you run, including the forgotten ones, and check its version against the vendor advisory.
- Apply the vendor's fix or mitigation, before December 18, 2023 if you are bound by CISA's deadline, sooner if it faces the internet.
- Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
References
H2 Security
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Start freeSource: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.