How severe is CVE-2022-25226?

CVE-2022-25226 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-25226 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-25226?

CVE-2022-25226 affects Cybelsoft Thinvnc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-25226?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-25226 published?

CVE-2022-25226 was published on 2022-04-18 and last updated on 2026-06-17.

CVE-2022-25226

CVE-2022-25226 is a critical-severity vulnerability in Cybelsoft Thinvnc with a CVSS 3.x base score of 10.0. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 7.5
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cybelsoft Thinvnc
Published: 2022-04-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2022-25226?: 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.
How severe is CVE-2022-25226?: CVE-2022-25226 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-25226 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-25226?: CVE-2022-25226 affects Cybelsoft Thinvnc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-25226?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-25226 published?: CVE-2022-25226 was published on 2022-04-18 and last updated on 2026-06-17.

References

https://fluidattacks.com/advisories/sinatra/

Affected products (1)

cpe:2.3:a:cybelsoft:thinvnc:1.0:b1:*:*:*:*:*:*

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