Is CVE-2026-20434 actively exploited?

No active exploitation of CVE-2026-20434 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-20434 be exploited remotely?

Partially. CVE-2026-20434 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-20434?

CVE-2026-20434 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-20434

CWE-787Published: March 2, 2026· Updated: Mar 2, 2026

7.5

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:16.3th

Official 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 needed for exploitation. Patch ID: MOLY00782946; Issue ID: MSV-4135.

NVD Source

Technical Analysis

CVE-2026-20434 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.