SB2026072245 - Multiple vulnerabilities in Autel MaxiCharger AC Elite Home

Description

This security bulletin contains information about 5 vulnerabilities.

1) Improper Verification of Cryptographic Signature (CVE-ID: CVE-2026-13305)

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

CVSSv4: CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper validation of a user-supplied software update image. An attacker with physical access can execute arbitrary code on the target system.

2) Integer underflow (CVE-ID: CVE-2026-13308)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer underflow within the handling of WebSocket messages related to the OCPP service. A remote attacker can trigger integer underflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

3) Heap-based buffer overflow (CVE-ID: CVE-2026-13307)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the handling of custom USB packets. An attacker with physical access can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

4) Stack-based buffer overflow (CVE-ID: CVE-2026-13309)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the handling of card responses via the NFC interface. An attacker with physical access can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

5) Improper Authentication (CVE-ID: CVE-2026-13306)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to bypass authentication process.

The vulnerability exists due to an error when processing authentication requests within the exposed USB interface. An attacker with physical access can bypass authentication process and gain unauthorized access to the application.

Remediation

Install update from vendor's website.

References

• https://www.zerodayinitiative.com/advisories/ZDI-26-433/
• https://www.zerodayinitiative.com/advisories/ZDI-26-437/
• https://www.zerodayinitiative.com/advisories/ZDI-26-436/
• https://www.zerodayinitiative.com/advisories/ZDI-26-435/
• https://www.zerodayinitiative.com/advisories/ZDI-26-434/