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MediaTek Modem CVE-2026-20543

| EUVDEUVD-2026-92180 MEDIUM
Insertion of Sensitive Information Into Debugging Code (CWE-215)
2026-10-05 security@mediatek.com GHSA-xph5-44g7-gggh
5.5
CVSS 3.1 · Vendor: mediatek
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain low-privileged local code execution on device
  2. Exploit
    Interact with vulnerable modem interface
  3. Execution
    Trigger logic error in modem handling
  4. Impact
    Read disclosed sensitive information

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Debug information protection
Exploitation Conditions

Exploitation requires local access to a device built on an affected MediaTek chipset (80+ models listed, e.g., MT6983, MT6895, MT6989, MT6768) and a baseline low privilege level (PR:L) - typically an installed or compromised app running with ordinary, non-root permissions that can reach the modem interface. No user interaction is required and no privilege escalation beyond that baseline is needed. Limiting factors: the attacker must already have local code execution on the device (no remote/network vector), the impact is confined to confidentiality (information disclosure only, no code execution or device compromise), and only MediaTek-based devices on unpatched modem firmware prior to patch MOLY01645293 are affected.

Impact

This is a moderate-severity local information disclosure in MediaTek Modem firmware, rated CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) and classed as CWE-215 (information exposure through debug information). The CVSS vector is internally consistent with the description: local attack vector (AV:L) matches 'local information disclosure,' PR:L matches 'no additional execution privileges needed' (i.e., some baseline low privilege is still required, not none), and UI:N matches 'user interaction is not needed.' Impact is confidentiality-only and high (C:H/I:N/A:N). There is no EPSS score, no CISA KEV listing, and no public proof-of-concept in the provided data, so there is no public exploit identified at time of analysis. No SSVC decision data was supplied. Because exploitation requires local access plus low privileges on the device and yields disclosure only (no code execution, integrity, or availability impact), this is a real but lower-tier priority rather than an urgent, remotely-weaponizable flaw - it is best treated as a patch-in-normal-cycle issue, with the caveat that the extremely broad MediaTek chipset footprint raises aggregate exposure. Note that PR:L indicates authenticated/local-privilege exploitation; the phrase 'no additional execution privileges needed' refers to not escalating beyond that baseline, not to unauthenticated access.

Exploit ScenarioDerived

A malicious or compromised low-privileged app already running on a MediaTek-based Android device interacts with the modem interface and, due to a logic error, is served sensitive information it should not have access to (e.g., debug or memory contents per CWE-215). No user interaction and no privilege escalation beyond the app's existing permissions are required. No public proof-of-concept is identified in the available data, so exploitation would require local reverse-engineering of the modem logic.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 05, 2026

Local information disclosure in MediaTek Modem firmware affects devices built on more than 80 MediaTek chipset models, including MT6983, MT6895, MT6989, and MT6768, when running unpatched modem firmware. A local app with ordinary low privileges (PR:L) can access sensitive modem debug information without user interaction, yielding high confidentiality impact but no code execution or integrity/availability loss; CVSS is 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N). No public exploit code has been identified at time of analysis, and there is no CISA KEV entry indicating confirmed active exploitation, but MediaTek patch MOLY01645293 and the October 2026 product security bulletin address the flaw.

RemediationAI

Apply the vendor fix by updating device firmware through the OEM to a build containing MediaTek patch MOLY01645293, as referenced in the MediaTek October 2026 Product Security Bulletin (https://www.mediatek.com/product-security-bulletin/October-2026). Because the issue is in modem firmware, users cannot patch independently; they must wait for OEM/carrier updates for their specific device model. Until a patched build is available, compensating controls are limited and local-only: restrict installation of untrusted or sideloaded apps, remove unnecessary apps that could interact with modem interfaces, enforce mobile device management policies that prevent sideloading and keep OS/modem firmware updated, and avoid granting sensitive permissions to untrusted applications. These controls reduce the attack surface but do not fully mitigate the flaw because any locally installed app with ordinary privileges on an unpatched device may still trigger the information disclosure. No remote workaround exists.

Affected VersionsENISA

MediaTek chipset MT6983
MediaTek chipset MT6739
MediaTek chipset MT2737
MediaTek chipset MT8673
MediaTek chipset MT6895
MediaTek chipset MT8775
MediaTek chipset MT6781
MediaTek chipset MT8793
MediaTek chipset MT6789
MediaTek chipset MT6980
MediaTek chipset MT6768
MediaTek chipset MT6853
MediaTek chipset MT6896
MediaTek chipset MT6993
MediaTek chipset MT6879
MediaTek chipset MT6891
MediaTek chipset MT8771
MediaTek chipset MT8788E
MediaTek chipset MT8765
MediaTek chipset MT6785
MediaTek chipset MT6761
MediaTek chipset MT6875
MediaTek chipset MT6989
MediaTek chipset MT2716
MediaTek chipset MT6982
MediaTek chipset MT8766
MediaTek chipset MT6779
MediaTek chipset MT6783
MediaTek chipset MT8873
MediaTek chipset MT6988
MediaTek chipset MT6877
MediaTek chipset MT6855
MediaTek chipset MT8863
MediaTek chipset MT8883
MediaTek chipset MT8788
MediaTek chipset MT6771
MediaTek chipset MT2735
MediaTek chipset MT6985
MediaTek chipset MT8791T
MediaTek chipset MT6885
MediaTek chipset MT6899
MediaTek chipset MT6881
MediaTek chipset MT6873
MediaTek chipset MT8792
MediaTek chipset MT8768
MediaTek chipset MT8676
MediaTek chipset MT6890
MediaTek chipset MT6991
MediaTek chipset MT6858
MediaTek chipset MT6986
MediaTek chipset MT8893
MediaTek chipset MT8789
MediaTek chipset MT8795T
MediaTek chipset MT8668
MediaTek chipset MT8781
MediaTek chipset MT6813
MediaTek chipset MT6880
MediaTek chipset MT6889
MediaTek chipset MT6835
MediaTek chipset MT8675
MediaTek chipset MT6763
MediaTek chipset MT6767
MediaTek chipset MT6762
MediaTek chipset MT8797
MediaTek chipset MT8678
MediaTek chipset MT8786
MediaTek chipset MT6897
MediaTek chipset MT6893
MediaTek chipset MT6878
MediaTek chipset MT6886
MediaTek chipset MT6765
MediaTek chipset MT6769
MediaTek chipset MT8755
MediaTek chipset MT8766R
MediaTek chipset MT6833
MediaTek chipset MT8791
MediaTek chipset MT8798
MediaTek chipset MT6990
MediaTek chipset MT6883
MediaTek chipset MT8666
MediaTek chipset MT8796
MediaTek chipset MT6815
MediaTek chipset MT8667

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Technical ContextAI · show details

The flaw resides in MediaTek modem firmware and is classified as CWE-215 (Insertion of Sensitive Information Into Debugging Code), meaning a logic error causes sensitive debug or diagnostic data to be exposed rather than merely a generic memory-safety bug. The CVSS vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N shows the attack is local (AV:L), requires low privileges (PR:L), needs no user interaction (UI:N), and impacts only confidentiality (C:H); integrity and availability are unaffected. Exploitation requires an attacker to already have local code execution or an installed/compromised app on a device using an affected MediaTek chipset, and then reach the modem interface to read information that should be protected. The EUVD advisory lists over 80 impacted MediaTek chipsets and no CPE strings were supplied in the input data.

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Severity by source

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

Local vector and low privilege (an installed app) per 'local' and 'no additional execution privileges needed'; UI:N as stated; confidentiality-only high impact, no integrity or availability effect.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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
High
Integrity
None
Availability
None

Lifecycle Timeline

3
CVSS changed
Oct 05, 2026 - 10:22 NVD
5.5 (MEDIUM)
CVE Published
Oct 05, 2026 - 02:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Oct 05, 2026 - 02:16 cve.org
MEDIUM 5.5

DescriptionCVE.org

In Modem, there is a possible information disclosure due to a logic error. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01645293; Issue ID: MSV-6761.

Threat Intelligence Overview

EPSS Score
0.1%
Top 98% exploitable
Prevalence
Ubiquitous
MediaTek is a top global mobile SoC vendor; 80+ chipsets affected
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.1%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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