CVE-2019-17662
CVE-2019-17662 is a critical-severity vulnerability in Cybelsoft Thinvnc with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 97% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.
Key facts
- Severity: Critical (CVSS 3.x base score 9.8)
- CVSS v2: 5.0
- EPSS exploit prediction: 97% (100th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Cybelsoft Thinvnc
- Published:
- Last modified:
Description
ThinVNC 1.0b1 is vulnerable to arbitrary file read, which leads to a compromise of the VNC server. The vulnerability exists even when authentication is turned on during the deployment of the VNC server. The password for authentication is stored in cleartext in a file that can be read via a ../../ThinVnc.ini directory traversal attack vector.
Frequently asked questions
- What is CVE-2019-17662?
- ThinVNC 1.0b1 is vulnerable to arbitrary file read, which leads to a compromise of the VNC server. The vulnerability exists even when authentication is turned on during the deployment of the VNC server. The password for authentication is stored in cleartext in a file that can be read via a ../../ThinVnc.ini directory traversal attack vector.
- How severe is CVE-2019-17662?
- CVE-2019-17662 has a CVSS 3.x base score of 9.8, 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-2019-17662 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 97% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-17662?
- CVE-2019-17662 affects Cybelsoft Thinvnc. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-17662?
- 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-2019-17662 published?
- CVE-2019-17662 was published on 2019-10-16 and last updated on 2026-06-17.
References
- http://packetstormsecurity.com/files/154896/ThinVNC-1.0b1-Authentication-Bypass.html
- https://github.com/bewest/thinvnc/issues/5
- https://github.com/shashankmangal2/Exploits/blob/master/ThinVNC-RemoteAccess/POC.py
- https://redteamzone.com/ThinVNC/
Affected products (1)
- cpe:2.3:a:cybelsoft:thinvnc:1.0:b1:*:*:*:*:*:*
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