CVE-2025-62864: Ampere AmpereOne AC03 devices · Out-of-bounds Write
Source CVE Database V5
Not known to be exploited · CVSS 9.8 Critical · fixed in 5.4.5.1 : patch affected systems as a priority.
Data as of 26 Oct 2026, 17:16 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.4.5.1, 4.4.5.2, 3.5.9.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 16 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
1. 2. Implement network-level filtering to restrict or block malformed SMC calls to the UEFI-MM MMCommunicate service, limiting exposure to remote exploitation. 3. Employ intrusion detection and prevention systems (IDPS) capable of identifying anomalous UEFI-related traffic or behavior indicative of exploitation attempts. 4. Conduct firmware integrity checks and enable secure boot features to detect unauthorized modifications to the UEFI firmware. 5. Isolate critical infrastructure systems using these devices within segmented network zones to reduce attack surface and lateral movement opportunities. 6. Develop and test incident response plans that include firmware compromise scenarios to ensure rapid containment and recovery. 7. Engage with hardware vendors for guidance on interim mitigations and best practices until official patches are deployed. 8. Maintain up-to-date asset inventories to identify all affected devices and prioritize remediation efforts accordingly.
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.