CVE-2021-45428Public exploitNetwork attack vector

Unauthenticated file upload via enabled HTTP PUT

Published Jan 3, 2022 · Updated Aug 4, 2024

Incorrect access control in Telesquare TLR-2005KSH allows remote attackers to upload arbitrary HTML and CGI files through HTTP PUT. The device HTTP service accepts unauthenticated PUT requests and stores attacker-supplied HTML or CGI content without enforcing access control. The direct consequence is an unauthenticated arbitrary file write; uploaded CGI content executes only when the destination invokes it as CGI.

CVSS severity9.8
Critical
EPSS probability56.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect access control in Telesquare TLR-2005KSH allows remote attackers to upload arbitrary HTML and CGI files through HTTP PUT. The device HTTP service accepts unauthenticated PUT requests and stores attacker-supplied HTML or CGI content without enforcing access control. The direct consequence is an unauthenticated arbitrary file write; uploaded CGI content executes only when the destination invokes it as CGI.

The record

CVE
CVE-2021-45428
Published
Jan 3, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

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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