# CVE-2026-20453: MediaTek GenieZone out-of-bounds write privilege escalation

Source: https://junglewise.ai/threats/cve-2026-20453-mediatek-geniezone-out-of-bounds-write-privilege-escalation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-01. Updated: 2026-06-01  
License: CC BY 4.0 with a link back

CVE-2026-20453 · Severity: info · CVSS 0 · Published 2026-06-01

A vulnerability in MediaTek's GenieZone virtualization software could allow a malicious actor to gain higher-level system privileges. To exploit this, an attacker must already have significant access to the device. If successful, they could bypass security boundaries to gain deeper control over the hardware, potentially compromising the entire device's security architecture.

Technologies: [MediaTek GenieZone](https://junglewise.ai/threats/technologies/geniezone). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20453 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20453 being exploited in the wild.

**How severe is CVE-2026-20453?** Informational severity, with a CVSS score of 0, published 1 June 2026.

**Which products and versions are affected?** MediaTek GenieZone.

**Is there a fix for CVE-2026-20453?** 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-2026-20453 attacked?** It is attacked with local access, in device firmware.

**Am I affected by CVE-2026-20453?** Check whether you run MediaTek GenieZone. 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 (OOB) write vulnerability exists in MediaTek GenieZone (a hypervisor/TEE environment) due to insufficient bounds checking on input. A local attacker who has already compromised the 'System' privilege level can exploit this flaw to perform an unauthorized memory write. This can lead to a further escalation of privilege within the secure environment. The exploit does not require user interaction. MediaTek has released a fix under Patch ID ALPS10886526.

## Affected products

- MediaTek GenieZone

## Timeline

- 2026-06-01: disclosed
- 2026-06-01: advisory

## References

- [https://corp.mediatek.com/product-security-bulletin/June-2026](https://corp.mediatek.com/product-security-bulletin/June-2026)

## Related threats

- [MediaTek Geniezone information disclosure via missing bounds check](https://junglewise.ai/threats/cve-2026-20518-mediatek-geniezone-information-disclosure-via-missing-bounds)
- [MediaTek geniezone use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-20517-mediatek-geniezone-use-after-free-privilege-escalation)
- [MediaTek geniezone out-of-bounds write](https://junglewise.ai/threats/cve-2026-20481-mediatek-geniezone-out-of-bounds-write)
- [MediaTek GenieZone out-of-bounds write privilege escalation](https://junglewise.ai/threats/cve-2026-20455-mediatek-geniezone-out-of-bounds-write-privilege-escalation)
- [MediaTek GenieZone out of bounds write via race condition](https://junglewise.ai/threats/cve-2026-20454-mediatek-geniezone-out-of-bounds-write-via-race-condition)