CVE-2021-46418Public exploitNetwork attack vector

Unauthenticated CGI file creation via HTTP PUT

Published Apr 7, 2022 · Updated Aug 4, 2024

Improper authorization in Telesquare TLR-2855KS6 allows remote attackers to create CGI scripts through unauthenticated HTTP PUT requests. The appliance web server accepts PUT at /cgi-bin/testing_cve.txt and writes the supplied request body without checking authorization. The network service must be reachable; successful exploitation changes appliance content, but no disclosure or service interruption is established.

CVSS severity7.5
High
EPSS probability23.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Telesquare TLR-2855KS6 allows remote attackers to create CGI scripts through unauthenticated HTTP PUT requests. The appliance web server accepts PUT at /cgi-bin/testing_cve.txt and writes the supplied request body without checking authorization. The network service must be reachable; successful exploitation changes appliance content, but no disclosure or service interruption is established.

The record

CVE
CVE-2021-46418
Published
Apr 7, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 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

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 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

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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