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MediaTek Modem EUVDEUVD-2026-72197

| CVE-2026-20504 MEDIUM
Reachable Assertion (CWE-617)
2026-09-07 MediaTek GHSA-p2x2-q5j5-2mj9
5.3
CVSS 3.1 · Vendor: MediaTek
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Severity by source

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

AV:A because the rogue base station must be in cellular radio range; AC:H for the operational difficulty of forcing UE attachment; C:N/I:N as only modem DoS results.

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

Primary rating from Vendor (MediaTek).

CVSS VectorVendor: MediaTek

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

Lifecycle Timeline

3
Analysis Generated
Sep 07, 2026 - 11:31 vuln.today
CVE Published
Sep 07, 2026 - 01:57 cve.org
MEDIUM 5.3
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 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.

AnalysisAI

Remote denial-of-service in MediaTek Modem firmware affects 19 chipset variants spanning the MT6xxx and MT8xxx families - when a device embedding an affected chipset connects to an attacker-controlled rogue base station, a missing bounds check (CWE-617: Reachable Assertion) in the modem subsystem triggers a system crash, causing loss of connectivity. The CVSS score of 5.3 (AV:A/AC:H) reflects the elevated operational complexity of deploying rogue cellular infrastructure to exploit this flaw. …

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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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Persist
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires two concurrent conditions: (1) the target device must contain one of the 19 affected MediaTek chipsets running unpatched modem firmware, and (2) the device must successfully attach to an attacker-operated rogue base station - requiring the attacker to physically deploy radio infrastructure broadcasting a stronger signal than the legitimate carrier within range of the target. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS vector AV:A/AC:H accurately captures the practical threat model: exploitation is bounded by the attacker's ability to deploy rogue cellular base station (fake eNB/gNB) infrastructure within radio range of the target device and to force the device to camp on the rogue cell - a significant operational barrier that limits this to well-resourced adversaries rather than opportunistic attackers. … 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 MediaTek has released a modem firmware patch identified as MOLY00755024 (Issue ID: MSV-7865), documented in the September 2026 Product Security Bulletin at https://www.mediatek.com/product-security-bulletin/September-2026. … 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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EUVD-2026-72197 vulnerability details – vuln.today

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