CVE-2025-53914Public exploit

Physical root access via unauthenticated UART console

Published Sep 9, 2025 · Updated Sep 12, 2025

Improper privilege management in seven Calix GigaCenter ONT models allows physically proximate attackers to gain root access via UART. The Broadcom SoC debugging console accepts a 115200-baud serial connection and opens a full root shell without requesting credentials. Physical access, device disassembly, and a USB-to-UART adapter are required; affected models are 812G, 813G, 818G, 844E, 844G, 844GE, and 854GE.

CVSS severity7.0
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in seven Calix GigaCenter ONT models allows physically proximate attackers to gain root access via UART. The Broadcom SoC debugging console accepts a 115200-baud serial connection and opens a full root shell without requesting credentials. Physical access, device disassembly, and a USB-to-UART adapter are required; affected models are 812G, 813G, 818G, 844E, 844G, 844GE, and 854GE.

The record

CVE
CVE-2025-53914
Published
Sep 9, 2025
Updated
Sep 12, 2025
Vendor
Calix
Product
GigaCenter ONT
Classifications
CWE-269, CAPEC-122, T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=812G
  2. Affected versionversion=813G
  3. Affected versionversion=818G
  4. Affected versionversion=844E
  5. Affected versionversion=844G
  6. Affected versionversion=844GE
  7. Affected versionversion=854GE

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Calix · GigaCenter ONTversion=812G; version=813G; version=818G; version=844E; version=844G; version=844GE; version=854GE

Published CVSS scores

7.0Fluid AttacksCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-269Improper Privilege Management
CAPEC-122Privilege Abuse
T1200Hardware Additions

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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