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CVE-2026-20455

Out-of-bounds write in Mediatek Mt6739 Firmware

CVSS score

7.8

EPSS probability

%0.1

Risk score

0.0

Published

4 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-20455 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

In geniezone, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10873936; Issue ID: MSV-6784.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20455 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1mediatekmt6739 firmware View
2mediatekmt6739 View
3mediatekmt6761 firmware View
4mediatekmt6761 View
5mediatekmt6765 firmware View
6mediatekmt6765 View
7mediatekmt6768 firmware View
8mediatekmt6768 View
9mediatekmt6781 firmware View
10mediatekmt6781 View
11mediatekmt6789 firmware View
12mediatekmt6789 View
13mediatekmt6835 firmware View
14mediatekmt6835 View
15mediatekmt6853 firmware View
16mediatekmt6853 View
17mediatekmt6855 firmware View
18mediatekmt6855 View
19mediatekmt6877 firmware View
20mediatekmt6877 View
21mediatekmt6878 firmware View
22mediatekmt6878 View
23mediatekmt6879 firmware View
24mediatekmt6879 View
25mediatekmt6883 firmware View
26mediatekmt6883 View
27mediatekmt6885 firmware View
28mediatekmt6885 View
29mediatekmt6886 firmware View
30mediatekmt6886 View
31mediatekmt6889 firmware View
32mediatekmt6889 View
33mediatekmt6893 firmware View
34mediatekmt6893 View
35mediatekmt6895 firmware View
36mediatekmt6895 View
37mediatekmt6897 firmware View
38mediatekmt6897 View
39mediatekmt6899 firmware View
40mediatekmt6899 View
41mediatekmt6983 firmware View
42mediatekmt6983 View
43mediatekmt6985 firmware View
44mediatekmt6985 View
45mediatekmt6989 firmware View
46mediatekmt6989 View
47mediatekmt6991 firmware View
48mediatekmt6991 View
49mediatekmt8673 firmware View
50mediatekmt8673 View
51mediatekmt8765 firmware View
52mediatekmt8765 View
53mediatekmt8766 firmware View
54mediatekmt8766 View
55mediatekmt8768 firmware View
56mediatekmt8768 View
57mediatekmt8781 firmware View
58mediatekmt8781 View
59mediatekmt8786 firmware View
60mediatekmt8786 View
61mediatekmt8788 firmware View
62mediatekmt8788 View
63mediatekmt8791t firmware View
64mediatekmt8791t View
65mediatekmt8793 firmware View
66mediatekmt8793 View
67mediatekmt8797 firmware View
68mediatekmt8797 View
69mediatekmt8798 firmware View
70mediatekmt8798 View
71mediatekmt8910 firmware View
72mediatekmt8910 View
Total affected vendors: 1|Products: 72

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
7.8CVSS V31HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20455 is associated with the following CWEs:

CWE-787: Out-of-bounds Write

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20455 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsLow
UserGerekmiyor

Official Sources and Advisories

https://corp.mediatek.com/product-security-bulletin/June-2026vendor-advisory

CVSS Vector Radar Chart

7.8 / 10
Attack VectorLocalComplexityLowPrivilegesLowUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow privileges
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

M
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mediatek

Weakness Type (CWE & CAPEC)

CWE-787

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