CVE-2023-42135 — PAX A920Pro/A50 devices with PayDroid_8

PAX A920Pro/A50 devices with PayDroid_8.1.0_Sagittarius_V11.1.50_20230614 or earlier can allow local code execution via parameter injection by bypassing the input validation when flashing a specific partition.

01What is this vulnerability?

PAX A920Pro/A50 devices with PayDroid_8.1.0_Sagittarius_V11.1.50_20230614 or earlier can allow local code execution via parameter injection by bypassing the input validation when flashing a specific partition.

02Affected products

Vendor	Product	Versions
PAX Technology	A920 Pro	0
PAX Technology	A50	0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

08Timeline

• Published: 2024-01-15T13:28:55.478Z
• Last modified: 2025-06-17T21:09:22.557Z

09References

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