CVE-2023-4818

PAX A920 device allows to downgrade bootloader due to a bug in its version check. The signature is correctly checked and only bootloader signed by PAX can be used. The attacker must have physical USB access to the device in order to exploit this vulnerability.

Affected

PAX Technology · A920

CVSS v3.1 NVD

7.6 HIGHCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

0.66% chance of exploitation in the next 30 days, 51st percentile

Published

2024-01-15

Updated

2025-06-17

Proof-of-concept exploits (1)

• https://blog.stmcyber.com/pax-pos-cves-2023/

Security advisories

• https://blog.stmcyber.com/pax-pos-cves-2023
• https://cert.pl/en/posts/2024/01/CVE-2023-4818
• https://cert.pl/posts/2024/01/CVE-2023-4818

References

• CVE Record
• NVD entry