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CVE-2026-20503

Quick assessment

Affected
MediaTek, Inc. MediaTek chipset
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Modem（调制解调器）模块中，由于缺少边界检查，可能导致系统崩溃。如果用户设备（UE）连接到由攻击者控制的恶意基站，则可能引发远程拒绝服务（DoS）攻击。利用此漏洞无需额外的执行权限，且不需要用户交互即可触发。补丁编号：MOLY01371002；问题编号：MSV-9020。

AI Predicted 7.5 Difficulty: Moderate
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I. Basic Information for CVE-2026-20503

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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: MOLY01371002; Issue ID: MSV-9020.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MediaTek, Inc. MediaTek chipset MT2716 -

II. Public POCs for CVE-2026-20503

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III. Intelligence Information for CVE-2026-20503

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Vendor Advisories for CVE-2026-20503 (1)

Same Patch Batch · MediaTek, Inc. · 2026-09-07 · 18 CVEs total

CVE-2026-20509 Power HAL越界写导致本地提权
CVE-2026-20500 Modem 输入验证不当致本地拒绝服务
CVE-2026-20501 vdec堆缓冲区溢出：本地提权
CVE-2026-20502 vdec 缓冲区越界写导致本地提权
CVE-2026-20504 Modem缺失边界检查导致远程拒绝服务
CVE-2026-20516 MiracastService 权限提升漏洞
CVE-2026-20506 Audio HAL UAF 本地权限提升漏洞
CVE-2026-20507 Audio HAL：系统权限下use after free提权漏洞
CVE-2026-20508 Power HAL 类型混淆致本地提权漏洞
CVE-2026-20518 geniezone 越界检查缺失致信息泄露
CVE-2026-20510 相机中间件双重重用致本地提权
CVE-2026-20511 SurfaceFlinger 内存破坏（Use-After-Free）致本地提权
CVE-2026-20512 Audio HAL权限提升漏洞
CVE-2026-20513 Audio HAL信息泄露：System权限下本地信息暴露
CVE-2026-20514 Audio HAL 信息泄露：缺少权限检查
CVE-2026-20515 GPU系统因释放后使用致崩溃并泄露信息
CVE-2026-20517 GenieZone 系统权限提升漏洞（UAF）

IV. Related Vulnerabilities

Same product: MediaTek chipset
Same vendor: MediaTek, Inc.
Same weakness: CWE-617

V. Comments for CVE-2026-20503

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