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MediaTek Modem CVE-2026-20479

| EUVDEUVD-2026-52068 HIGH
Out-of-bounds Read (CWE-125)
2026-08-03 MediaTek GHSA-6g35-p5gh-6qh4
7.5
CVSS 3.1 · Vendor: MediaTek
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Severity by source

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

Cellular air interface is network-reachable; attacker controls rogue base station (AC:L); no device privileges or user interaction required; impact is availability-only per vendor description.

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

Primary rating from Vendor (MediaTek).

CVSS VectorVendor: MediaTek

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Aug 03, 2026 - 20:41 vuln.today
CVE Published
Aug 03, 2026 - 02:05 cve.org
HIGH 7.5
CVE Published
Aug 03, 2026 - 02:05 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In Modem, there is a possible out of bounds read 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: MOLY00741071; Issue ID: MSV-7620.

AnalysisAI

Out-of-bounds read in MediaTek modem firmware across 19 chipsets enables remote denial of service when a User Equipment (UE) is connected to an attacker-controlled rogue base station. The flaw stems from a missing bounds check (CWE-125) in modem protocol processing, crashing or disrupting the modem without requiring any user interaction or device-side privileges. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Deploy rogue base station near target
Delivery
UE auto-associates with stronger rogue signal
Exploit
Send crafted malformed cellular PDU
Execution
Modem processes PDU without bounds check
Persist
Out-of-bounds read triggers crash
Impact
Modem DoS, device loses cellular connectivity

Vulnerability AssessmentAI

Exploitation The critical prerequisite is that the target User Equipment (UE) must have connected to an attacker-controlled rogue base station - this is not a standard internet-reachable attack. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects the no-interaction, no-auth nature of the attack and the full availability impact, but warrants contextualization: AV:N here represents the cellular radio interface, not a standard internet reachable service, and effectively requires the attacker to operate a rogue base station within range of the target. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker deploys a software-defined radio rogue base station broadcasting a stronger signal than legitimate towers in the target area, causing nearby UEs running affected MediaTek chipsets to automatically associate with it. The attacker's rogue base station then transmits a crafted cellular protocol message containing a data unit that lacks proper length bounds, triggering the OOB read in the modem firmware and causing the modem to crash, resulting in complete loss of cellular connectivity on the victim device. …
Remediation Apply the MediaTek-issued patch identified as MOLY00741071 (Issue ID: MSV-7620), distributed through device OEM firmware updates as part of the August 2026 MediaTek security bulletin (https://www.mediatek.com/product-security-bulletin/August-2026). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, audit device inventory to identify endpoints using affected MediaTek chipsets and prioritize by operational criticality. …

Sign in for detailed remediation steps and compensating controls.

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

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CVE-2026-20479 vulnerability details – vuln.today

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