CVE-2026-30704Public exploit

Firmware and credential disclosure via exposed UART

Published Mar 18, 2026 · Updated Mar 18, 2026

Hidden functionality in WDR201A WiFi Extender firmware LFMZX28040922V1.02 allows physically proximate attackers to read firmware. Accessible PCB pads expose an unauthenticated UART console, and boot-time input opens U-Boot, whose memory-display command copies the SPI flash contents. Physical access and a wired UART adapter are required; the disclosed procedure extracts the complete firmware image and embedded credentials without reaching the protected operating-system login.

CVSS severity9.1
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hidden functionality in WDR201A WiFi Extender firmware LFMZX28040922V1.02 allows physically proximate attackers to read firmware. Accessible PCB pads expose an unauthenticated UART console, and boot-time input opens U-Boot, whose memory-display command copies the SPI flash contents. Physical access and a wired UART adapter are required; the disclosed procedure extracts the complete firmware image and embedded credentials without reaching the protected operating-system login.

The record

CVE
CVE-2026-30704
Published
Mar 18, 2026
Updated
Mar 18, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-912, T1005
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-912Hidden Functionality
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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