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CVE-2026-20520

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

CVSS score

7.5

EPSS probability

%0.2

Risk score

0.0

Published

8 d 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-2026-20520 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 not needed for exploitation. Patch ID: MOLY01778988; Issue ID: MSV-8897.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20520 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1MediaTek, Inc.MediaTek chipset View
2mediatekmt2716 firmware View
3mediatekmt2716 View
4mediatekmt2735 firmware View
5mediatekmt2735 View
6mediatekmt2737 firmware View
7mediatekmt2737 View
8mediatekmt6813 firmware View
9mediatekmt6813 View
10mediatekmt6815 firmware View
11mediatekmt6815 View
12mediatekmt6833 firmware View
13mediatekmt6833 View
14mediatekmt6835 firmware View
15mediatekmt6835 View
16mediatekmt6853 firmware View
17mediatekmt6853 View
18mediatekmt6855 firmware View
19mediatekmt6855 View
20mediatekmt6858 firmware View
21mediatekmt6858 View
22mediatekmt6873 firmware View
23mediatekmt6873 View
24mediatekmt6875 firmware View
25mediatekmt6875 View
26mediatekmt6877 firmware View
27mediatekmt6877 View
28mediatekmt6878 firmware View
29mediatekmt6878 View
30mediatekmt6879 firmware View
31mediatekmt6879 View
32mediatekmt6880 firmware View
33mediatekmt6880 View
34mediatekmt6881 firmware View
35mediatekmt6881 View
36mediatekmt6883 firmware View
37mediatekmt6883 View
38mediatekmt6885 firmware View
39mediatekmt6885 View
40mediatekmt6886 firmware View
41mediatekmt6886 View
42mediatekmt6889 firmware View
43mediatekmt6889 View
44mediatekmt6890 firmware View
45mediatekmt6890 View
46mediatekmt6891 firmware View
47mediatekmt6891 View
48mediatekmt6893 firmware View
49mediatekmt6893 View
50mediatekmt6895 firmware View
51mediatekmt6895 View
52mediatekmt6896 firmware View
53mediatekmt6896 View
54mediatekmt6897 firmware View
55mediatekmt6897 View
56mediatekmt6899 firmware View
57mediatekmt6899 View
58mediatekmt6980 firmware View
59mediatekmt6980 View
60mediatekmt6982 firmware View
61mediatekmt6982 View
62mediatekmt6983 firmware View
63mediatekmt6983 View
64mediatekmt6985 firmware View
65mediatekmt6985 View
66mediatekmt6986 firmware View
67mediatekmt6986 View
68mediatekmt6988 firmware View
69mediatekmt6988 View
70mediatekmt6989 firmware View
71mediatekmt6989 View
72mediatekmt6990 firmware View
73mediatekmt6990 View
74mediatekmt6991 firmware View
75mediatekmt6991 View
76mediatekmt6993 firmware View
77mediatekmt6993 View
78mediatekmt8668 firmware View
79mediatekmt8668 View
80mediatekmt8676 firmware View
81mediatekmt8676 View
82mediatekmt8678 firmware View
83mediatekmt8678 View
84mediatekmt8755 firmware View
85mediatekmt8755 View
86mediatekmt8771 firmware View
87mediatekmt8771 View
88mediatekmt8775 firmware View
89mediatekmt8775 View
90mediatekmt8791 firmware View
91mediatekmt8791 View
92mediatekmt8791t firmware View
93mediatekmt8791t View
94mediatekmt8792 firmware View
95mediatekmt8792 View
96mediatekmt8793 firmware View
97mediatekmt8793 View
98mediatekmt8796 firmware View
99mediatekmt8796 View
100mediatekmt8797 firmware View
101mediatekmt8797 View
102mediatekmt8798 firmware View
103mediatekmt8798 View
104mediatekmt8863 firmware View
105mediatekmt8863 View
106mediatekmt8873 firmware View
107mediatekmt8873 View
108mediatekmt8883 firmware View
109mediatekmt8883 View
110mediatekmt8893 firmware View
111mediatekmt8893 View
112mediatekmt8695 firmware View
113mediatekmt8695 View
114mediatekmt8696 firmware View
115mediatekmt8696 View
Total affected vendors: 2|Products: 115

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
7.5CVSS V3_1HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCVE ADP
7.5CVSS V31HIGHCVSS:3.1/AV:A/AC:H/PR:N/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-2026-20520 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-2026-20520 weaknesses.

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

Attack Vector and Accessibility

ExposureBitişik ağ
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://www.mediatek.com/product-security-bulletin/October-2026vendor-advisory

CVSS Vector Radar Chart

7.5 / 10
Attack VectorAdjacentComplexityHighPrivilegesNoneUser Interact.NoneConfidentialityHighIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorAdjacent network
Attack ComplexityHigh
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)High
Integrity (Bütünlük)None
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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