HOME VULNERABILITIESCVE-2021-27198

CRITICAL

CVE-2021-27198

CWE-434Published: February 26, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in Visualware MyConnection Server before v11.1a. Unauthenticated Remote Code Execution can occur via Arbitrary File Upload in the web service when using a myspeed/sf?filename= URI. This application is written in Java and is thus cross-platform. The Windows installation runs as SYSTEM, which means that exploitation gives one Administrator privileges on the target system.

Technical Analysis

CVE-2021-27198 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

visualware1 product(s)

myconnection server

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/161571/VisualWare-MyConnection-Server-11.x-Remote-Code-Execution.html

ADVISORYhttp://seclists.org/fulldisclosure/2021/Feb/81

ADVISORYhttps://myconnectionserver.visualware.com/download.html

ADVISORYhttps://myconnectionserver.visualware.com/support/newrelease.html

ADVISORYhttps://www.securifera.com/advisories/cve-2021-27198/

ADVISORYhttp://packetstormsecurity.com/files/161571/VisualWare-MyConnection-Server-11.x-Remote-Code-Execution.html

ADVISORYhttp://seclists.org/fulldisclosure/2021/Feb/81

ADVISORYhttps://myconnectionserver.visualware.com/download.html

ADVISORYhttps://myconnectionserver.visualware.com/support/newrelease.html

ADVISORYhttps://www.securifera.com/advisories/cve-2021-27198/

All References (10)

→

http://packetstormsecurity.com/files/161571/VisualWare-MyConnection-Server-11.x-Remote-Code-Execution.htmlThird Party Advisory · VDB Entry

→

http://seclists.org/fulldisclosure/2021/Feb/81Mailing List · Third Party Advisory

→

https://myconnectionserver.visualware.com/download.htmlProduct · Vendor Advisory

→

https://myconnectionserver.visualware.com/support/newrelease.htmlRelease Notes · Vendor Advisory

→

https://www.securifera.com/advisories/cve-2021-27198/Third Party Advisory

→

http://packetstormsecurity.com/files/161571/VisualWare-MyConnection-Server-11.x-Remote-Code-Execution.htmlThird Party Advisory · VDB Entry

→

http://seclists.org/fulldisclosure/2021/Feb/81Mailing List · Third Party Advisory

→

https://myconnectionserver.visualware.com/download.htmlProduct · Vendor Advisory

→

https://myconnectionserver.visualware.com/support/newrelease.htmlRelease Notes · Vendor Advisory

→

https://www.securifera.com/advisories/cve-2021-27198/Third Party Advisory

Quick Facts

CVE IDCVE-2021-27198

CVSS Score9.8 / 10

SeverityCRITICAL

WeaknessCWE-434

CISA KEVNo

Affected1 vendor(s)

PublishedFeb 26, 2021

Related CVEs (CWE-434)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2021-27198 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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