CVE intelligence and bounded remediation

CVE-2023-6448 — Unitronics Vision PLC and HMI Insecure Default Password Vulnerability

Critical CVSS 9.8 CISA KEV

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.

Severity
Critical
CVSS
9.8 (3.1)
Published
2023-12-05
CISA KEV
Known exploited
Ecosystem
operating-system
Weaknesses
CWE-1188, CWE-798

Affected products

  • unitronics / vision1210_firmware
  • unitronics / vision1040_firmware
  • unitronics / vision700_firmware
  • unitronics / vision570_firmware
  • unitronics / vision560_firmware
  • unitronics / vision430_firmware

Showing 6 representative product identities from 17 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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