CVE-2023-4818: PAX A920 device allows to downgrade bootloader due to a bug in its version check

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HIGH 7.6MITIGATE

CVE-2023-4818 is a high-severity flaw (CVSS 7.6) affecting paydroid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.6 (High)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-74
Published	2024-01-15
Last modified	2026-06-17

Publisher (CNA): CERT.PL · Vendor: paxtechnology

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-01-15 14:15 UTCPublished CVE record published
2026-06-17 06:38 UTCUpdated Record last modified

paxtechnology paydroid MITIGATE

Affected: 7.1.2_aquarius_11.1.50_20230614

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.1.2_aquarius_11.1.50_20230614

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-4818?

paydroid: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-4818 being exploited?

CVE-2023-4818 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-4818 affect?

CVE-2023-4818 affects paydroid. Severity is high (CVSS 7.6). 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 ex

How urgent is CVE-2023-4818?

Priority 45/100. High severity; Public exploit reference

Related CVEs

CVE-2023-42137 HIGH 7.8 UPGRADE PAX Android based POS devices with PayDroid_8.1.0_Sagittarius_V11.1.50_20230614 or earlier can allow for comma
CVE-2023-42136 HIGH 7.8 UPGRADE PAX Android based POS devices with PayDroid_8.1.0_Sagittarius_V11.1.50_20230614 or earlier can allow the execu
CVE-2023-42135 MEDIUM 6.8 UPGRADE PAX A920Pro/A50 devices with PayDroid_8.1.0_Sagittarius_V11.1.50_20230614 or earlier can allow local code exec
CVE-2023-42134 MEDIUM 6.8 UPGRADE PAX Android based POS devices with PayDroid_8.1.0_Sagittarius_V11.1.45_20230314 or earlier can allow the signe

References

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