CVE-2026-20449 | BDVDB-2026-330296 Detail

MediaTekMediaTek chipset

Description#

In Modem, there is a possible system crash due to a heap buffer overflow. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01760138; Issue ID: MSV-6148.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact none, availability impact high. Attack vector: adjacent.

Weaknesses#

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

References#

https://corp.mediatek.com/product-security-bulletin/May-2026

Exploit#

No public exploit known

History#

Version 12026-05-04Record published in the CVE List.

Published

Published: 2026-05-04
Last modified: 2026-05-04

Vendor information

Vendor: MediaTek
Product: MediaTek chipset

All MediaTek vulnerabilities

Score

6.5 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 13.1.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
MT2735
Fixed
Not stated
Vulnerable
MT2737
Fixed
Not stated
Vulnerable
MT6739
Fixed
Not stated
Vulnerable
MT6761
Fixed
Not stated
Vulnerable
MT6762
Fixed
Not stated
Vulnerable
MT6763
Fixed
Not stated
Vulnerable
MT6765
Fixed
Not stated
Vulnerable
MT6767
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.5 Medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Metric breakdown
Attack Vector	Adjacent
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	High

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).