CVE-2025-62863

Secure memory corruption via malformed SMC call

Published Dec 16, 2025 · Updated Dec 16, 2025

Out-of-bounds write in AmpereOne UEFI-MM PCIe firmware allows local users to corrupt Secure-EL0 driver memory via a malformed SMC call. The PCIe handler processes an incorrectly formed SMC request and writes beyond memory mapped into its Secure-EL0 address space. Local high privileges are required; affected firmware is AC03 before 3.5.9.3, AC04 before 4.4.5.2, and AmpereOne M before 5.4.5.1.

CVSS severity4.6
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in AmpereOne UEFI-MM PCIe firmware allows local users to corrupt Secure-EL0 driver memory via a malformed SMC call. The PCIe handler processes an incorrectly formed SMC request and writes beyond memory mapped into its Secure-EL0 address space. Local high privileges are required; affected firmware is AC03 before 3.5.9.3, AC04 before 4.4.5.2, and AmpereOne M before 5.4.5.1.

The record

CVE
CVE-2025-62863
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.6Ampere ComputingCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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