Vulnerability · Published Nov 2, 2026 · Assigned by MediaTek

CVE-2026-20566

Medium 4.8

In plain English

A medium-severity out-of-bounds write in MediaTek chipset from MediaTek, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.2%top 95.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, if a malicious actor has already obtained the System privilege. User interaction is needed for exploitation. Patch ID: MOLY01923663 / ALPS11315955; Issue ID: MSV-10866.

Affected products (as reported)

Vendor	Product	Versions
MediaTek, Inc.	MediaTek chipset	MT2716MT2735MT2737MT6813MT6815MT6833MT6835MT6853

Weakness: CWE-787 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

References

https://www.mediatek.com/product-security-bulletin/November-2026