---
title: "CVE-2023-6448: Unitronics Vision PLC and HMI Insecure Default Password Vulnerability"
url: https://erroneo.us/security/cve/CVE-2023-6448/
description: "CVE-2023-6448 (Unitronics Vision PLC and HMI): Exploited in the wild (CISA KEV). Unitronics VisiLogic before version 9.9.00, used in Vision and Samba PLCs…"
type: vulnerability-record
section: "Security Digest"
date_published: 2023-12-05
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2023-6448"
kev: true
cvss: 9.8
epss: 0.02089
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Unitronics Vision PLC and HMI. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2023-12-11, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2023-12-18 ; treat that as the outer limit, not the target.
- EPSS 2.1% , percentile 81: FIRST’s model estimates a 2.1% chance of exploitation activity in the next 30 days, higher than 81% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- Unitronics VisiLogic: < 9.9.00

## Severity

- cisa-cg CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2023-12-11; federal due date 2023-12-18. Known ransomware use: Unknown.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 2.09% probability of exploitation activity in the next 30 days; percentile 81.

## Sources

- [downloads.unitronicsplc.com](https://downloads.unitronicsplc.com/Sites/plc/Visilogic/Version_Changes-Bug_Reports/VisiLogic%209.9.00%20Version%20changes.pdf)
- [downloads.unitronicsplc.com](https://downloads.unitronicsplc.com/Sites/plc/Technical_Library/Unitronics-Cybersecurity-Advisory-2023-001-CVE-2023-6448.pdf)
- [CVE.org record CVE-2023-6448](https://www.cve.org/CVERecord?id=CVE-2023-6448)
- [NVD entry CVE-2023-6448](https://nvd.nist.gov/vuln/detail/CVE-2023-6448)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-6448)
- [cisa.gov](https://www.cisa.gov/news-events/alerts/2023/11/28/exploitation-unitronics-plcs-used-water-and-wastewater-systems)
- [unitronicsplc.com](https://www.unitronicsplc.com/cyber_security_vision-samba/)

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Source page: https://erroneo.us/security/cve/CVE-2023-6448/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt