6.5
MEDIUM CVSS 3.1
CVE-2026-20449
"Modem HEAP Buffer Overflow Vulnerability"
Description

In Modem, there is a possible system crash due to a heap buffer overflow. 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: MOLY01760138; Issue ID: MSV-6148.

INFO

Published Date :

May 4, 2026, 7:15 a.m.

Last Modified :

May 7, 2026, 12:43 p.m.

Remotely Exploit :

No
Affected Products

The following products are affected by CVE-2026-20449 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Mediatek mt2735
2 Mediatek mt6779
3 Mediatek mt6781
4 Mediatek mt6783
5 Mediatek mt6785
6 Mediatek mt6789
7 Mediatek mt6813
8 Mediatek mt6833
9 Mediatek mt6835
10 Mediatek mt6853
11 Mediatek mt6855
12 Mediatek mt6873
13 Mediatek mt6875
14 Mediatek mt6877
15 Mediatek mt6878
16 Mediatek mt6879
17 Mediatek mt6880
18 Mediatek mt6883
19 Mediatek mt6885
20 Mediatek mt6886
21 Mediatek mt6889
22 Mediatek mt6890
23 Mediatek mt6891
24 Mediatek mt6893
25 Mediatek mt6895
26 Mediatek mt6896
27 Mediatek mt6897
28 Mediatek mt6980
29 Mediatek mt6985
30 Mediatek mt6989
31 Mediatek mt6990
32 Mediatek mt8675
33 Mediatek mt8791
34 Mediatek mt8791t
35 Mediatek mt8797
36 Mediatek mt6739
37 Mediatek mt6761
38 Mediatek mt6762
39 Mediatek mt6763
40 Mediatek mt6765
41 Mediatek mt6768
42 Mediatek mt6769
43 Mediatek mt6983
44 Mediatek mt8673
45 Mediatek mt8798
46 Mediatek mt6771
47 Mediatek mt8676
48 Mediatek mt8678
49 Mediatek mt8755
50 Mediatek mt8775
51 Mediatek mt8792
52 Mediatek mt6767
53 Mediatek mt6815
54 Mediatek mt8893
55 Mediatek mt8771
56 Mediatek mt8795t
57 Mediatek mt2737
58 Mediatek mt6899
59 Mediatek mt6991
60 Mediatek mt8863
61 Mediatek mt6986d
62 Mediatek mt2735_firmware
63 Mediatek mt2737_firmware
64 Mediatek mt6739_firmware
65 Mediatek mt6761_firmware
66 Mediatek mt6762_firmware
67 Mediatek mt6763_firmware
68 Mediatek mt6765_firmware
69 Mediatek mt6767_firmware
70 Mediatek mt6768_firmware
71 Mediatek mt6769_firmware
72 Mediatek mt6771_firmware
73 Mediatek mt6779_firmware
74 Mediatek mt6781_firmware
75 Mediatek mt6783_firmware
76 Mediatek mt6785_firmware
77 Mediatek mt6789_firmware
78 Mediatek mt6813_firmware
79 Mediatek mt6833_firmware
80 Mediatek mt6835_firmware
81 Mediatek mt6853_firmware
82 Mediatek mt6855_firmware
83 Mediatek mt6873_firmware
84 Mediatek mt6875_firmware
85 Mediatek mt6877_firmware
86 Mediatek mt6878_firmware
87 Mediatek mt6879_firmware
88 Mediatek mt6880_firmware
89 Mediatek mt6883_firmware
90 Mediatek mt6885_firmware
91 Mediatek mt6886_firmware
92 Mediatek mt6889_firmware
93 Mediatek mt6890_firmware
94 Mediatek mt6891_firmware
95 Mediatek mt6893_firmware
96 Mediatek mt6895_firmware
97 Mediatek mt6896_firmware
98 Mediatek mt6897_firmware
99 Mediatek mt6899_firmware
100 Mediatek mt6980_firmware
101 Mediatek mt6983_firmware
102 Mediatek mt6985_firmware
103 Mediatek mt6989_firmware
104 Mediatek mt6990_firmware
105 Mediatek mt6991_firmware
106 Mediatek mt8673_firmware
107 Mediatek mt8675_firmware
108 Mediatek mt8676_firmware
109 Mediatek mt8678_firmware
110 Mediatek mt8771_firmware
111 Mediatek mt8791t_firmware
112 Mediatek mt8797_firmware
113 Mediatek mt8798_firmware
114 Mediatek mt8863_firmware
115 Mediatek mt6988
116 Mediatek mt8873
117 Mediatek mt8883
118 Mediatek mt8793
119 Mediatek mt6993
120 Mediatek mt8668
121 Mediatek mt6858
122 Mediatek mt6815_firmware
123 Mediatek mt6993_firmware
124 Mediatek mt8668_firmware
125 Mediatek mt8755_firmware
126 Mediatek mt8775_firmware
127 Mediatek mt8792_firmware
128 Mediatek mt8793_firmware
129 Mediatek mt8873_firmware
130 Mediatek mt8883_firmware
131 Mediatek mt8791_firmware
132 Mediatek mt8795t_firmware
133 Mediatek mt8893_firmware
134 Mediatek mt6858_firmware
135 Mediatek mt6986d_firmware
136 Mediatek mt6988_firmware
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM 134c704f-9b21-4f2e-91b3-4a467353bcc0
Solution
Apply the vendor patch to fix a heap buffer overflow and prevent remote denial of service.
  • Apply the vendor patch for MOLY01760138.
  • Update the modem firmware.
  • Mitigate heap buffer overflow vulnerabilities.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20449.

URL Resource
https://corp.mediatek.com/product-security-bulletin/May-2026 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20449 is associated with the following CWEs:

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20449 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2026-20449 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    May. 07, 2026

    Action Type Old Value New Value
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6763_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6763:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6765_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6765:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6767_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6767:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6768_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6768:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6769_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6769:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6771_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6771:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6779_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6779:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6781_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6781:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6783_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6783:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6785_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6785:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6789_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6789:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6813_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6813:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6815_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6815:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6833_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6835_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6835:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6853_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6855_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6858_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6858:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6873_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6873:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6875_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6875:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6877_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6878_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6878:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6879_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6879:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6880_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6880:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6883_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6885_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6886_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6886:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6889_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6890_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6891_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6891:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6893_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6895_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6895:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6896_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6896:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6897_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6897:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6899_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6899:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6980_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6980:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6983_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6983:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6985_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6985:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6986d_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6986d:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6988_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6988:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt2735_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt2735:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt2737_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt2737:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6739_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6739:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6761_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6761:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6762_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6762:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6989_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6989:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6990_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6990:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt6993_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6993:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8668_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8668:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8673_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8673:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8675_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8675:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8676_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8676:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8678_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8678:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8755_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8755:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8771_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8771:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8775_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8775:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8791_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8791:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8791t_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8791t:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8792_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8792:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8793_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8793:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8795t_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8795t:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8797_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8797:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8798_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8798:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8863_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8863:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8873_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8873:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8883_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8883:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8893_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8893:-:*:*:*:*:*:*:*
    Added Reference Type MediaTek, Inc.: https://corp.mediatek.com/product-security-bulletin/May-2026 Types: Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    May. 04, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • New CVE Received by [email protected]

    May. 04, 2026

    Action Type Old Value New Value
    Added Description In Modem, there is a possible system crash due to a heap buffer overflow. 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: MOLY01760138; Issue ID: MSV-6148.
    Added CWE CWE-120
    Added Reference https://corp.mediatek.com/product-security-bulletin/May-2026
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.