CVE-2021-21740

Directory disclosure via USB symbolic link

Published Aug 9, 2021 · Updated Aug 3, 2024

Information leak in the ZTE ZXHN H2640 V10.0.0C6_TY digital media player allows attackers to read directory information via a USB symbolic link. The DMS follows a symbolic link on an inserted USB disk and exposes directory data outside the authorized USB location. Physical access to insert the crafted disk is required, and the documented consequence is unauthorized directory-information disclosure without reported integrity or availability impact.

CVSS severity2.4
Low
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information leak in the ZTE ZXHN H2640 V10.0.0C6_TY digital media player allows attackers to read directory information via a USB symbolic link. The DMS follows a symbolic link on an inserted USB disk and exposes directory data outside the authorized USB location. Physical access to insert the crafted disk is required, and the documented consequence is unauthorized directory-information disclosure without reported integrity or availability impact.

The record

CVE
CVE-2021-21740
Published
Aug 9, 2021
Updated
Aug 3, 2024
Vendor
ZTE Corporation
Product
ZXHN H2640
Classifications
CWE-59, T1005
Attack vector
physical
Privileges
admin

Timeline

How it unfolded

  1. Aug 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=V10.0.0C6_TY

What conditions does exploitation require?

Attack vectorphysical
Required privilegesadmin

What is affected?

ZTE Corporation · ZXHN H2640version=V10.0.0C6_TY

Published CVSS scores

2.1NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
2.4NVDCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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