CVE-2026-20504: CWE-617 Reachable Assertion in MediaTek, Inc. MediaTek chipset
Description
In Modem, there is a possible system crash 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, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY00755024; Issue ID: MSV-7865.
CVSS v3.1
Score 5.3medium
Affected software
MediaTek, Inc.
MediaTek chipset
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a reachable assertion failure (CWE-617) in the modem component of various MediaTek chipsets. The absence of proper bounds checking can lead to a system crash, resulting in a remote denial of service condition. Exploitation requires a user equipment (UE) to connect to a malicious base station controlled by an attacker. No user interaction or elevated privileges are necessary for exploitation. The issue is tracked under Patch ID MOLY00755024 and Issue ID MSV-7865. No CVSS score or remediation level is currently provided, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation results in a remote denial of service by causing the modem system to crash. This can disrupt device connectivity and availability but does not grant execution privileges or other elevated access.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or mitigation instructions are currently published. Users and administrators should monitor MediaTek advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.028Z
- State
- PUBLISHED
Threat ID: 6a9e1c72acd9273b49c51d6d
Added to database: 09/07/2026, 02:07:46 UTC
Last enriched: 09/07/2026, 08:54:31 UTC
Last updated: 10/22/2026, 01:15:21 UTC
Views: 71
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