CVE-2026-20434
HIGHCVSS Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2Description
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: MOLY00782946; Issue ID: MSV-4135.
Analysis
Privilege escalation in Modem affects Nr17, Lr13, Nr16, Lr12a, and Nr15 devices through an out-of-bounds write vulnerability triggered when connecting to a rogue base station. An attacker controlling a malicious base station can achieve remote code execution and full system compromise without requiring additional privileges or user interaction beyond initial network connection. …
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Remediation
Within 24 hours: Inventory all devices with affected modems and assess business criticality. Within 7 days: Disable non-essential cellular connectivity where possible, restrict device usage in untrusted network environments, and establish a vulnerability tracking process for vendor patch availability. …
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External POC / Exploit Code
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