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Vulnerability record · CVE-2022-25226 · published 18 April 2022

CVE-2022-25226: Cybelsoft thinvnc vulnerability

Cybelsoft · Thinvnc

ThinVNC version 1.0b1 allows an unauthenticated user to bypass the authentication process via 'http://thin-vnc:8080/cmd?cmd=connect' by obtaining a valid SID without any kind of authentication. It is possible to achieve code execution on the server by sending keyboard or mouse events to the server.

10.0 CVSS 3.1 Critical EPSS 11% · top 4.2%
10.0CVSS 3.1 base score, v2 7.5
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

ThinVNC version 1.0b1 allows an unauthenticated user to bypass the authentication process via 'http://thin-vnc:8080/cmd?cmd=connect' by obtaining a valid SID without any kind of authentication. It is possible to achieve code execution on the server by sending keyboard or mouse events to the server.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://fluidattacks.com/advisories/sinatra/ ExploitThird Party Advisory
https://fluidattacks.com/advisories/sinatra/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-17662ThinVNC path traversal exposes cleartext VNC passwordThinVNC 1.0b1 allows an unauthenticated attacker to read arbitrary files through a ../../ThinVnc.ini directory traversal, and the VNC authentication …EPSS 97%analysed

Source: NIST National Vulnerability Database (record CVE-2022-25226), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.