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CVE-2026-20449: CWE-120 Classic Buffer Overflow in MediaTek, Inc. MediaTek chipset

0
Medium
VulnerabilityCVE-2026-20449cvecve-2026-20449cwe-120
Published: Mon May 04 2026 (05/04/2026, 05:41:54 UTC)
Source: CVE Database V5
Vendor/Project: MediaTek, Inc.
Product: MediaTek 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.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 05/04/2026, 06:52:19 UTC

Technical Analysis

This vulnerability is a classic heap buffer overflow (CWE-120) in the modem of MediaTek chipsets, which can be triggered remotely by connecting a UE to a malicious base station. The overflow can cause a system crash resulting in denial of service without requiring user interaction or elevated privileges. The issue affects numerous MediaTek chipset versions. Although a patch ID (MOLY01760138) and issue ID (MSV-6148) are referenced, no explicit patch or remediation level has been confirmed in the vendor advisory or CVE data. The vulnerability was published on May 4, 2026, and no CVSS score is available.

Potential Impact

Successful exploitation results in a remote denial of service condition on affected devices by causing a system crash. There is no indication of privilege escalation or code execution beyond denial of service. Exploitation requires the UE to connect to a rogue base station controlled by an attacker. No user interaction is needed.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The referenced patch ID suggests a fix may exist, but no official confirmation or update is provided. Until an official fix is available, avoid connecting devices to untrusted or rogue base stations where possible.

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Technical Details

Data Version
5.2
Assigner Short Name
MediaTek
Date Reserved
2025-11-03T01:30:59.013Z
Cvss Version
null
State
PUBLISHED
Remediation Level
null

Threat ID: 69f83e68cbff5d8610c9d599

Added to database: 5/4/2026, 6:36:24 AM

Last enriched: 5/4/2026, 6:52:19 AM

Last updated: 5/5/2026, 5:58:41 AM

Views: 9

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