CVE-2023-5028Public exploit

Default-password disclosure via cleartext UART logging

Published Sep 17, 2023 · Updated Jun 18, 2025

Information disclosure in China Unicom TEWA-800G 4.16L.04_CT2015_Yueme allows physically proximate attackers to read its default password. The UART console log prints the device default password in cleartext when a TTL serial connection is used for debugging. Physical access, enclosure disassembly, and a TTL cable are required; the demonstrated consequence is disclosure of the appliance password.

CVSS severity4.6
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in China Unicom TEWA-800G 4.16L.04_CT2015_Yueme allows physically proximate attackers to read its default password. The UART console log prints the device default password in cleartext when a TTL serial connection is used for debugging. Physical access, enclosure disassembly, and a TTL cable are required; the demonstrated consequence is disclosure of the appliance password.

The record

CVE
CVE-2023-5028
Published
Sep 17, 2023
Updated
Jun 18, 2025
Vendor
Sichuan Tianyi Comheart Telecom Co., Ltd.
Product
TEWA-800G
Classifications
CWE-532, CWE-534, T1552.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 18, 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=4.16L.04_CT2015_Yueme

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Sichuan Tianyi Comheart Telecom Co., Ltd. · TEWA-800Gversion=4.16L.04_CT2015_Yueme

Published CVSS scores

2.0VulDBCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
4.6NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
1.2VulDBAV:L/AC:H/Au:N/C:P/I:N/A: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 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-532Insertion of Sensitive Information into Log File
CWE-534DEPRECATED: Information Exposure Through Debug Log Files
T1552.001Credentials In Files

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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