PT-2026-5643 · Modem · Modem

Published 2026-02-02 · Updated 2026-02-02 · CVE-2026-20421

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Modem (affected versions not specified)

Description The Modem software contains a flaw related to improper input validation, potentially causing a system crash and leading to a remote denial of service. This can occur if a User Equipment (UE) connects to a malicious base station controlled by an attacker. Exploitation does not require additional privileges or user interaction.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-20421

Affected Products

Modem

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-20421 · Security Note
• https://corp.mediatek.com/product-security-bulletin/February-2026 · Vendor Advisory
• https://twitter.com/CVEnew/status/2018249243757302238 · Twitter Post
• https://t.me/CVEtracker/43481 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2018289733932118429 · Twitter Post