CVE-2025-62862: amperecomputing ampereone_a128-34x_firmware Out-of-bounds Read

Vulnerability summary

CVE-2025-62862 is a medium (CVSS 4.6) Out-of-bounds Read vulnerability in amperecomputing ampereone_a128-34x_firmware. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 1.9% of scored vulnerabilities.

Timeline

1. 16-12-2025
   PublishedVulnerability first disclosed.
2. 17-12-2025
   Last modifiedVulnerability information updated.

Description

Ampere AmpereOne AC03 devices before 3.5.9.3, AmpereOne AC04 devices before 4.4.5.2, and AmpereOne M devices before 5.4.5.1 allow an incorrectly formed SMC call to UEFI-MM Boot Error Record Table driver that could result in (1) an out-of-bounds read which leaks Secure-EL0 information to a process running in Non-Secure state or (2) an out-of-bounds write which corrupts Secure or Non-Secure memory, limited to memory mapped to UEFI-MM Secure Partition by the Secure Partition Manager.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.