7.5
HIGH
CVSS 3.1
CVE-2026-20519
Modem Out-of-Bounds Write Vulnerability
Overview
Description
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: MOLY01778993; Issue ID: MSV-8898.
Details
INFO
Published Date :
Oct. 5, 2026, 2:16 a.m.
Last Modified :
Oct. 8, 2026, 2:49 p.m.
Remotely Exploit :
No
Source :
[email protected]
Impact
Affected Products
The following products are affected by CVE-2026-20519
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.
Scoring
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 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
Apply the vendor-provided patch to fix an out-of-bounds write vulnerability.
- Apply the vendor patch MOLY01778993.
- Update the Modem firmware.
- Ensure UE is not connected to rogue base stations.
References
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-2026-20519.
| URL | Resource |
|---|---|
| https://www.mediatek.com/product-security-bulletin/October-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-2026-20519 is
associated with the following CWEs:
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-2026-20519
weaknesses.
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-2026-20519 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-20519 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]
Oct. 08, 2026
Action Type Old Value New Value 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:mt6881_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6881:-:*:*:*:*:*:*:* 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:mt6982_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6982:-:*:*:*:*:*:*:* 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:mt6986_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt6986:-:*:*:*:*:*:*:* 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: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: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:mt2716_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt2716:-:*:*:*:*:*:*:* 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: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: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:mt8796_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8796:-:*:*:*:*:*:*:* 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 CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8695_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8695:-:*:*:*:*:*:*:* Added CPE Configuration AND OR *cpe:2.3:o:mediatek:mt8696_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:mediatek:mt8696:-:*:*:*:*:*:*:* Added Reference Type MediaTek, Inc.: https://www.mediatek.com/product-security-bulletin/October-2026 Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 06, 2026
Action Type Old Value New Value Removed SSVC {'id': 'CVE-2026-20519', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-05T10:35:10.989384Z'} Added SSVC {'id': 'CVE-2026-20519', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-05T00:00:00+00:00'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 05, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added SSVC {'id': 'CVE-2026-20519', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-05T10:35:10.989384Z'} -
New CVE Received by [email protected]
Oct. 05, 2026
Action Type Old Value New Value Added Description 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: MOLY01778993; Issue ID: MSV-8898. Added CWE CWE-787 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/20xxx/CVE-2026-20519.json">CVE-2026-20519</a> Added Reference https://www.mediatek.com/product-security-bulletin/October-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.