CVE-2025-62864
CWE-787Published: December 16, 2025· Updated: Jun 17, 2026
Official 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 MMCommunicate service that could result in an out-of-bounds write within the UEFI-MM Secure Partition context.
Risk Analysis
AmpereOne devices are vulnerable to an out-of-bounds write in the UEFI-MM Secure Partition context due to an incorrectly formed SMC call. This critical vulnerability could allow an attacker to compromise the secure partition.
No public exploit is currently known for this remotely exploitable vulnerability.
Upgrade firmware to version 3.5.9.3 for AC03, 4.4.5.2 for AC04, or 5.4.5.1 for AmpereOne M devices.
Technical Analysis
CVE-2025-62864 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (2)
Quick Facts
Related CVEs (CWE-787)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-62864 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts