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MediaTek Modem CVE-2026-20500

| EUVDEUVD-2026-72193 MEDIUM
Improper Certificate Validation (CWE-295)
2026-09-07 MediaTek GHSA-3wwc-gvmj-fpx5
5.5
CVSS 3.1 · Vendor: MediaTek
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Severity by source

Vendor (MediaTek) PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.0 MEDIUM

Local vector, low privilege, user interaction required (per description despite UI:N in provided vector); availability-only impact from modem crash.

3.1 AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (MediaTek).

CVSS VectorVendor: MediaTek

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Sep 07, 2026 - 11:34 vuln.today
CVE Published
Sep 07, 2026 - 01:57 cve.org
MEDIUM 5.5
CVE Published
Sep 07, 2026 - 01:57 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In Modem, there is a possible system crash due to improper input validation. This could lead to local denial of service with User execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01810811; Issue ID: MSV-9232.

AnalysisAI

Improper input validation in the modem firmware component of 22 MediaTek chipsets allows a local user-privileged process to trigger a system crash, resulting in a denial of service. The flaw, tracked as patch ID MOLY01810811 / MSV-9232, requires user interaction to trigger and is confined to an unprivileged local context, limiting its practical impact to availability disruption rather than data exposure or code execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires local access and user-level execution privileges (PR:L per CVSS vector) on a device running one of the 22 affected MediaTek chipsets. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk is moderate-to-low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the modem firmware patch identified as MOLY01810811 (Issue ID: MSV-9232), distributed through MediaTek's September 2026 Product Security Bulletin. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-20500 vulnerability details – vuln.today

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