---
title: "CVE-2026-20554: Modem - Privilege Escalation"
description: "Modem contains a privilege escalation caused by missing bounds check, letting remote attackers escalate privileges if a UE connects to a rogue base station, exploit requires user interaction."
url: https://panop.io/threat-heartbeat/CVE-2026-20554/
---

# CVE-2026-20554 Modem - Privilege Escalation

Modem contains a privilege escalation caused by missing bounds check, letting remote attackers escalate privileges if a UE connects to a rogue base station, exploit requires user interaction.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-20554)

## Details

Type

Privilege Escalation

Impact

Privilege Escalation

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

2 November 2026

Updated

3 November 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to the latest version with patch MOLY01911177 applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-20554](https://nvd.nist.gov/vuln/detail/CVE-2026-20554)
- [https://www.mediatek.com/product-security-bulletin/November-2026](https://www.mediatek.com/product-security-bulletin/November-2026)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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