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Varaxon Technologies

Known exploited vulnerability · CISA KEV

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

Unitronics Vision Series PLCs and HMIs ship with an insecure default password, which if left unchanged, can allow attackers to execute remote commands.

CVE-2023-6448

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2023-12-11: attackers are using it right now.

CISA KEV
Listed
Added 2023-12-11 · federal fix-by 2023-12-18
EPSS (30 days)
2.1%
Higher than 82% of CVEs · 2026-11-01
CVSS v3.1
9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What CISA says

Unitronics Vision PLC and HMI Insecure Default Password Vulnerability

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

NVD description · published 2023-12-05

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.

Full record on NVD

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How to check if you are exposed to CVE-2023-6448

  1. Find every Unitronics Vision PLC and HMI system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2023-6448.

US federal agencies had to fix this by 2023-12-18. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Affected versions

Versions the National Vulnerability Database lists as vulnerable to CVE-2023-6448. Check the vendor advisory for the exact fixed builds before you sign anything off.

ProductVulnerable versions
Unitronics Vision1210 Firmwarebefore 12.38
Unitronics Vision1040 Firmwarebefore 12.38
Unitronics Vision700 Firmwarebefore 12.38
Unitronics Vision570 Firmwarebefore 12.38
Unitronics Vision560 Firmwarebefore 12.38
Unitronics Vision430 Firmwarebefore 12.38

NVD lists 11 more affected products; see the full record on NVD.

Timeline

  1. · Published in the National Vulnerability Database
  2. · Added to CISA's Known Exploited Vulnerabilities catalog, 6 days after it was published
  3. · Fix-by date for US federal agencies, passed 1,049 days ago

Vendor advisories and fixes

Weakness type

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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