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CVE-2026-20433

Out-of-bounds write in MediaTek, Inc. MediaTek Chipset

CVSS score

8.0

EPSS probability

%0.3

Risk score

0.0

Published

6 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-2026-20433 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is needed for exploitation. Patch ID: MOLY01088681; Issue ID: MSV-4460.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20433 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1MediaTek, Inc.MediaTek chipset View
2mediatekmt2735 firmware View
3mediatekmt2735 View
4mediatekmt2737 firmware View
5mediatekmt2737 View
6mediatekmt6813 firmware View
7mediatekmt6813 View
8mediatekmt6833 firmware View
9mediatekmt6833 View
10mediatekmt6833p firmware View
11mediatekmt6833p View
12mediatekmt6835 firmware View
13mediatekmt6835 View
14mediatekmt6835t firmware View
15mediatekmt6835t View
16mediatekmt6853 firmware View
17mediatekmt6853 View
18mediatekmt6853t firmware View
19mediatekmt6853t View
20mediatekmt6855 firmware View
21mediatekmt6855 View
22mediatekmt6855t firmware View
23mediatekmt6855t View
24mediatekmt6873 firmware View
25mediatekmt6873 View
26mediatekmt6875 firmware View
27mediatekmt6875 View
28mediatekmt6875t firmware View
29mediatekmt6875t View
30mediatekmt6877 firmware View
31mediatekmt6877 View
32mediatekmt6877t firmware View
33mediatekmt6877t View
34mediatekmt6877tt firmware View
35mediatekmt6877tt View
36mediatekmt6878 firmware View
37mediatekmt6878 View
38mediatekmt6878m firmware View
39mediatekmt6878m View
40mediatekmt6879 firmware View
41mediatekmt6879 View
42mediatekmt6880 firmware View
43mediatekmt6880 View
44mediatekmt6883 firmware View
45mediatekmt6883 View
46mediatekmt6885 firmware View
47mediatekmt6885 View
48mediatekmt6886 firmware View
49mediatekmt6886 View
50mediatekmt6889 firmware View
51mediatekmt6889 View
52mediatekmt6890 firmware View
53mediatekmt6890 View
54mediatekmt6891 firmware View
55mediatekmt6891 View
56mediatekmt6893 firmware View
57mediatekmt6893 View
58mediatekmt6895 firmware View
59mediatekmt6895 View
60mediatekmt6895tt firmware View
61mediatekmt6895tt View
62mediatekmt6896 firmware View
63mediatekmt6896 View
64mediatekmt6897 firmware View
65mediatekmt6897 View
66mediatekmt6899 firmware View
67mediatekmt6899 View
68mediatekmt6980 firmware View
69mediatekmt6980 View
70mediatekmt6980d firmware View
71mediatekmt6980d View
72mediatekmt6983 firmware View
73mediatekmt6983 View
74mediatekmt6983t firmware View
75mediatekmt6983t View
76mediatekmt6985 firmware View
77mediatekmt6985 View
78mediatekmt6985t firmware View
79mediatekmt6985t View
80mediatekmt6989 firmware View
81mediatekmt6989 View
82mediatekmt6989t firmware View
83mediatekmt6989t View
84mediatekmt6990 firmware View
85mediatekmt6990 View
86mediatekmt6991 firmware View
87mediatekmt6991 View
88mediatekmt8668 firmware View
89mediatekmt8668 View
90mediatekmt8673 firmware View
91mediatekmt8673 View
92mediatekmt8675 firmware View
93mediatekmt8675 View
94mediatekmt8676 firmware View
95mediatekmt8676 View
96mediatekmt8678 firmware View
97mediatekmt8678 View
98mediatekmt8755 firmware View
99mediatekmt8755 View
100mediatekmt8771 firmware View
101mediatekmt8771 View
102mediatekmt8775 firmware View
103mediatekmt8775 View
104mediatekmt8791 firmware View
105mediatekmt8791 View
106mediatekmt8791t firmware View
107mediatekmt8791t View
108mediatekmt8792 firmware View
109mediatekmt8792 View
110mediatekmt8793 firmware View
111mediatekmt8793 View
112mediatekmt8795t firmware View
113mediatekmt8795t View
114mediatekmt8797 firmware View
115mediatekmt8797 View
116mediatekmt8798 firmware View
117mediatekmt8798 View
118mediatekmt8863 firmware View
119mediatekmt8863 View
120mediatekmt8873 firmware View
121mediatekmt8873 View
122mediatekmt8883 firmware View
123mediatekmt8883 View
124mediatekmt8893 firmware View
125mediatekmt8893 View
Total affected vendors: 2|Products: 125

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
8.8CVSS V31HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HNVD
8.0CVSS V31HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HNVD
8.0CVSS V3_1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVE ADP

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-2026-20433 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-2026-20433 weaknesses.

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

Attack Vector and Accessibility

ExposureBitişik ağ
PermissionsGerekmiyor
UserGerekiyor

Official Sources and Advisories

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

CVSS Vector Radar Chart

8.0 / 10
Attack VectorAdjacentComplexityLowPrivilegesNoneUser Interact.RequiredConfidentialityLowIntegrityHighAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack VectorAdjacent network
Attack ComplexityLow
Privileges RequiredNone required
User Interaction—
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)High
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

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

Follow the vendor

MI
MediaTek, Inc. logo
MediaTek, Inc.
M
mediatek logo
mediatek

Weakness Type (CWE & CAPEC)

CWE-787

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CVE-2026-20433 · Out-of-bounds write in MediaTek, Inc.…