CVE-2021-41550Public exploitNetwork attack vector

Authenticated code execution via executable Perl upload

Published Jan 18, 2022 · Updated Aug 4, 2024

Unrestricted file upload in Leostream Connection Broker 9.0.40.17 allows remote authenticated users to execute Perl code. Third Party Content accepts a .pl file into /home/leo/app/tpc, where the default web-server configuration executes it when its /tpc/ URL is requested. Administrator access, or a custom role permitted to upload third-party content, is required; successful execution runs attacker-supplied server-side code.

CVSS severity7.2
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Leostream Connection Broker 9.0.40.17 allows remote authenticated users to execute Perl code. Third Party Content accepts a .pl file into /home/leo/app/tpc, where the default web-server configuration executes it when its /tpc/ URL is requested. Administrator access, or a custom role permitted to upload third-party content, is required; successful execution runs attacker-supplied server-side code.

The record

CVE
CVE-2021-41550
Published
Jan 18, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-434, CAPEC-1, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 18, 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 privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1059Command and Scripting Interpreter

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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