CVE-2026-20519: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
Description
CVE-2026-20519 is an out-of-bounds write vulnerability in MediaTek chipsets' modem component caused by a missing bounds check. This flaw could allow remote escalation of privilege if a user equipment (UE) connects to a rogue base station controlled by an attacker. Exploitation does not require user interaction or additional execution privileges. Multiple MediaTek chipset models are affected.
Affected software
MediaTek, Inc.
MediaTek chipset
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an out-of-bounds write in the modem of MediaTek chipsets due to a missing bounds check. An attacker controlling a rogue base station could exploit this flaw to escalate privileges remotely on the affected device without requiring user interaction or extra execution privileges. The issue is identified as CWE-787. A patch is referenced by Patch ID MOLY01778993 and Issue ID MSV-8898, but no explicit patch availability or vendor advisory details are provided in the input data.
Potential Impact
Successful exploitation could lead to remote escalation of privilege on devices using the affected MediaTek chipsets when connected to a malicious base station. This could compromise device security without user interaction or additional privileges. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The input data references a patch ID but does not confirm availability or deployment. Until official fixes are confirmed, users should avoid connecting to untrusted or rogue base stations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.032Z
- State
- PUBLISHED
Threat ID: 6ac309122cdf04f656a0bf8f
Added to database: 10/05/2026, 02:18:58 UTC
Last enriched: 10/05/2026, 02:48:34 UTC
Last updated: 10/05/2026, 03:08:14 UTC
Views: 4
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