# CVE-2026-66333: AMI APTIOV out-of-bounds read in BIOS firmware

Source: https://junglewise.ai/threats/cve-2026-66333-ami-aptiov-contains-vulnerabilities-in-bios-where-privileged  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-66333 · Severity: info · Published 2026-11-10

AMI APTIOV is a BIOS firmware used in computing systems. A vulnerability allows a privileged local user to read memory outside intended bounds, potentially causing system crashes during firmware updates or compromising data confidentiality and system availability.

Technologies: [AMI APTIOV](https://junglewise.ai/threats/technologies/aptiov). Vendors: [AMI](https://junglewise.ai/threats/vendors/ami).

## Quick answers

**Is CVE-2026-66333 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66333 being exploited in the wild.

**How severe is CVE-2026-66333?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** AMI APTIOV.

**Is there a fix for CVE-2026-66333?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-66333 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-66333?** Check whether you run AMI APTIOV. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An out-of-bounds read vulnerability exists in AMI APTIOV BIOS firmware that can be triggered by a privileged local attacker. The flaw may manifest as a denial of service (system crash or failed firmware update) when the out-of-bounds read accesses unmapped memory, and could also lead to information disclosure or availability impact.

## Affected products

- AMI APTIOV

## Timeline

- 2026-11-10: disclosed

## References

- [https://go.ami.com/hubfs/Security%20Advisories/2026/AMI-SA-2026003.pdf](https://go.ami.com/hubfs/Security%20Advisories/2026/AMI-SA-2026003.pdf)

## Related threats

- [AMI APTIOV out-of-bounds write in BIOS](https://junglewise.ai/threats/cve-2026-66334-ami-aptiov-contains-vulnerabilities-in-bios-where-privileged)
- [AMI APTIOV out-of-bounds read in BIOS](https://junglewise.ai/threats/cve-2026-66332-ami-aptiov-contains-a-vulnerability-in-bios-where-a-privileged)
- [AMI APTIOV BIOS information disclosure](https://junglewise.ai/threats/cve-2026-0893-ami-aptiov-contains-a-vulnerability-in-bios-where-an-attacker-may)
- [AMI APTIOV buffer overflow in BIOS](https://junglewise.ai/threats/cve-2025-58774-ami-aptiov-contains-vulnerabilities-in-bios-where-users-may-cause)
- [AMI APTIOV BIOS out-of-bounds write](https://junglewise.ai/threats/cve-2025-58773-ami-aptiov-contains-vulnerabilities-in-bios-where-users-may-cause)