VisualWare MyConnection Server 11.x Remote Code Execution

CVE Category Price Severity
CVE-2021-27198 CWE-434 $10,000 High
Author Risk Exploitation Type Date
mufeed_vr High Remote 2021-02-28
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at:

Below is a copy:

VisualWare MyConnection Server 11.x Remote Code Execution
Document Title:


VisualWare MyConnection Server 11.x Remote Code Execution Vulnerability



References (Source):



Release Date:




Product & Service Introduction:


MCS tests, measures & reports the performance and health of any network
connection, LAN or WAN. MCS is an access everywhere web based enterprise



Vulnerability Information:


Class: CWE-434: Unrestricted Upload of File with Dangerous Type

Impact: Remote Code Execution

Remotely Exploitable: Yes

Locally Exploitable: Yes

CVE Name: CVE-2021-27198


Vulnerability Description:


An unauthenticated remote code execution vulnerability was discovered in
Visualware MyConnection Server 11.0 through 11.0b build 5382. The web
endpoint at "" provides an unauthenticated
user the ability to upload an arbitrary file to an arbitrary location via a
specially crafted POST request. This application is written in Java and is
thus cross-platform. The Windows installation executes the web server as
SYSTEM which means that exploitation provides Administrator privileges on
the target system.


Vulnerability Disclosure Timeline:


2021-01-11: Contacted VisualWare About Issue via Website Contact Form

2021-02-03: Emailed Multiple VisualWare POCs Requesting Disclosure

2021-02-11: Requested CVE from MITRE for vulnerability

2021-02-12: Messaged Lead VisualWare Developer on LinkedIn After Seeing They
Had Looked At My Profile. I assume because of my attempts to contact them

2021-02-18: Notified VisualWare About Issue Again via Website Contact Form
And Notified Them I Would be Disclosing if they did not respond

2021-02-25: Publicly releasing vulnerability because company refuses to
respond to any attempts to coordinate disclsoure



Affected Product(s):


VisualWare MyConnection Server 11.0 through 11.0b build 5382


Severity Level:




Proof of Concept (PoC):


A proof of concept will not be provided at this time.


Solution - Fix & Patch:




Security Risk:


The security risk of this remote code execution vulnerability is estimated
as high. (CVSS 10.0)


Credits & Authors:


Securifera, Inc - b0yd (@rwincey)


Disclaimer & Information:


The information provided in this advisory is provided as it is without any
warranty. Securifera disclaims all 

warranties, either expressed or implied, 

including the warranties of merchantability and capability for a particular
purpose. Securifera is not liable in any 

case of damage, 

including direct, indirect, incidental, consequential loss of business
profits or special damages, even if Securifera 

or its suppliers have been advised 

of the possibility of such damages. Some states do not allow the exclusion
or limitation of liability for consequential 

or incidental damages so the foregoing 

limitation may not apply. We do not approve or encourage anybody to break
any licenses, policies, or hack into any 




Contact: contact [at] securifera [dot] com



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