CVE-2025-58772: AMI APTIOV BIOS Buffer Overflow Vulnerability

CVE-2025-58772 Overview

CVE-2025-58772 is a classic buffer overflow vulnerability [CWE-120] in AMI APTIOV BIOS firmware. An authenticated local attacker can trigger the overflow to corrupt memory and execute arbitrary code within the BIOS execution context. Successful exploitation impacts confidentiality, integrity, and availability of the affected system. Because the flaw resides in platform firmware, exploitation can subvert security controls that depend on firmware integrity. AMI published advisory AMI-SA-2026002 documenting the issue.

Critical Impact
Local exploitation can lead to buffer overflow, memory corruption, and arbitrary code execution inside BIOS firmware, undermining platform-level trust and availability.

Affected Products

AMI APTIOV BIOS firmware (see AMI-SA-2026002 for affected versions)
OEM platforms shipping AMI APTIOV BIOS
Server and workstation systems using APTIOV-based UEFI firmware

Discovery Timeline

2026-10-13 - CVE-2025-58772 published to the National Vulnerability Database (NVD)
2026-10-15 - Last updated in NVD database

Technical Details for CVE-2025-58772

Vulnerability Analysis

The vulnerability is a classic buffer overflow in the AMI APTIOV BIOS. APTIOV is AMI's implementation of the Unified Extensible Firmware Interface (UEFI) used by numerous OEMs. The flaw allows a local authenticated attacker to write beyond the bounds of a fixed-size buffer during BIOS processing of input data. This write can corrupt adjacent memory structures, including control data used by firmware routines. An attacker who shapes the overwritten memory can redirect execution flow inside the firmware. Because BIOS code executes before the operating system and with the highest platform privileges, compromise at this layer can defeat OS-level protections.

Root Cause

The root cause is improper length validation when copying data into a fixed-size buffer, categorized as [CWE-120] Buffer Copy without Checking Size of Input. The affected routine does not verify that attacker-controlled input fits the destination buffer before performing the copy, enabling adjacent memory corruption.

Attack Vector

Exploitation requires local access with low privileges and no user interaction. An attacker invokes the vulnerable BIOS interface from a running operating system or through BIOS-exposed interfaces reachable to a local user. Successful exploitation can escalate to arbitrary code execution in the firmware context and cause denial of service through platform instability.

No public proof-of-concept code is available at the time of publication. Technical specifics are published by the vendor in the AMI Security Advisory 2026002.

// No verified exploit code is published for CVE-2025-58772.
// Refer to AMI-SA-2026002 for vendor-provided technical details.

Detection Methods for CVE-2025-58772

Indicators of Compromise

Unexpected BIOS/UEFI configuration changes or firmware version mismatches reported by platform management tools
System instability, kernel panics, or unexplained reboots that correlate with firmware interface access
Measured boot or TPM PCR values that deviate from a known-good baseline

Detection Strategies

Compare firmware measurements against vendor-signed reference values using platform attestation
Monitor for unauthorized local processes that invoke SMI handlers or UEFI runtime services
Audit administrator sessions and privilege use on systems that expose firmware management interfaces

Monitoring Recommendations

Enable Windows Defender System Guard or equivalent firmware attestation where supported
Centralize firmware version inventory and alert on unexpected downgrades or changes
Correlate endpoint telemetry with hardware management controller logs for firmware update events

How to Mitigate CVE-2025-58772

Immediate Actions Required

Identify systems running AMI APTIOV BIOS and inventory firmware versions against AMI-SA-2026002
Apply OEM-provided BIOS updates that incorporate the AMI fix as soon as they are available
Restrict local administrative access on affected systems to reduce the exploitation surface

Patch Information

AMI has released fixed APTIOV firmware as described in the AMI Security Advisory 2026002. Firmware updates are delivered by OEM system vendors. Consult the hardware vendor's support site for a BIOS release that integrates the AMI patch for the affected platform.

Workarounds

Enforce least privilege so that only trusted administrators hold local accounts on affected hosts
Enable Secure Boot, BIOS administrator passwords, and firmware write protection where supported
Require measured boot and remote attestation for high-value systems until patches are deployed

bash

# Example: inventory BIOS vendor and version on Linux hosts
sudo dmidecode -s bios-vendor
sudo dmidecode -s bios-version
sudo dmidecode -s bios-release-date

# Example: inventory BIOS version on Windows hosts
wmic bios get Manufacturer,SMBIOSBIOSVersion,ReleaseDate