CVE-2023-6448
KEVUnitronics Vision PLC and HMI Insecure Default Password Vulnerability
Description
Unitronics Vision Series PLCs and HMIs ship with an insecure default password, which if left unchanged, can allow attackers to execute remote commands.
Unitronics VisiLogic before version 9.9.00, used in Vision and Samba PLCs and HMIs, uses a default administrative password. An unauthenticated attacker with network access can take administrative control of a vulnerable system.
CVSS 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HPublishedDec 5, 2023
Last modifiedJun 17, 2026
Added to KEVDec 11, 2023
Remediation dueDec 18, 2023
References
- downloads.unitronicsplc.com/Sites/plc/Technical_Library/Unitronics-Cybersecurity-Advisory-2023-001-CVE-2023-6448.pdfVendor Advisory
- downloads.unitronicsplc.com/Sites/plc/Visilogic/Version_Changes-Bug_Reports/VisiLogic%209.9.00%20Version%20changes.pdfRelease Notes
- cisa.gov/news-events/alerts/2023/11/28/exploitation-unitronics-plcs-used-water-and-wastewater-systemsThird Party AdvisoryUS Government Resource
- unitronicsplc.com/cyber_security_vision-samba/Product
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-6448US Government Resource
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Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1043 days
- CVSS
- 9.8 CRITICAL
- EPSS (30-day exploit probability)
- 2.1% · top 19% of all CVEs
- Weakness
- CWE-1188
- Attack vector
- Network, remotely reachable
- Preconditions
- No privileges and no user interaction
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.