CVE-2023-6448
CriticalExploitedPublic exploitUnitronics VisiLogic before version 9.9.00, used in Vision and Samba PLCs and HMIs, uses a default administrative password.
Published Dec 5, 2023 · Updated Feb 26, 2026
Key Facts
Patch immediately- CVE-2023-6448 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting VisiLogic (Unitronics), Samba 3.5 Firmware (Unitronics), Samba 4.3 Firmware (Unitronics) and 14 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 28, 2023. Public exploit code is available.
- EPSS estimates a 2.1% probability of exploitation in the next 30 days.
- Fixed versions are available, including Samba 3.5 Firmware 12.38, Samba 4.3 Firmware 12.38, Samba 7 Firmware 12.38.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
2.1%
Higher than 81.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-6448 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 11, 2023 | Dec 18, 2023 | Not reported |
| Industry KEV feed | Nov 28, 2023 | Dec 18, 2023 | Not reported |
| CIRCL KEV | Dec 11, 2023 | Dec 18, 2023 | Not reported |
| ENISA EUVD | Dec 11, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
18 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| VisiLogicUnitronics | See advisory | 9.9.00 |
| Samba 3.5 FirmwareUnitronics | See advisory | 12.38 |
| Samba 4.3 FirmwareUnitronics | See advisory | 12.38 |
| Samba 7 FirmwareUnitronics | See advisory | 12.38 |
| Vision1040 FirmwareUnitronics | See advisory | 12.38 |
Patched Releases
Samba 3.5 Firmware
12.38
Samba 4.3 Firmware
12.38
Samba 7 Firmware
12.38
VisiLogic
9.9.00
Vision1040 Firmware
12.38
Vision120 Firmware
12.38
Vision1210 Firmware
12.38
Vision130 Firmware
12.38
Vision230 Firmware
12.38
Vision280 Firmware
12.38
Vision290 Firmware
12.38
Vision350 Firmware
12.38
Vision430 Firmware
12.38
Vision530 Firmware
12.38
Vision560 Firmware
12.38
Vision570 Firmware
12.38
Vision700 Firmware
12.38
Timeline
Added to Industry KEV feed
Nov 28, 2023
Publicly disclosed
Dec 5, 2023
Added to CISA KEV
Dec 11, 2023
Added to CIRCL KEV
Dec 11, 2023
Added to ENISA EUVD
Dec 11, 2023
Last updated
Feb 26, 2026
Weakness Type
- CWE-798 Use of Hard-coded Credentials
- CWE-1188 Initialization of a Resource with an Insecure Default
References
- advisoryhttps://downloads.unitronicsplc.com/Sites/plc/Technical_Library/Unitronics-Cybersecurity-Advisory-2023-001-CVE-2023-6448.pdf
- advisoryVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
Unitronics VisiLogic before version 9.9.00, used in Vision and Samba PLCs and HMIs, uses a default administrative password.
Affected: VisiLogic (Unitronics); Samba 3.5 Firmware (Unitronics); Samba 4.3 Firmware (Unitronics), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 28, 2023.
Yes. It was added on Dec 11, 2023 with a federal remediation due date of Dec 18, 2023.
Public exploit code is available.
Fixed versions are available, including Samba 3.5 Firmware 12.38, Samba 4.3 Firmware 12.38, Samba 7 Firmware 12.38.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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