CVE-2023-27830

9.0 criticalEPSS 1.1%

Critical (9.0) in tightvnc tightvnc. EPSS 1.1% chance of exploitation in the next 30 days.

TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted files when executing a file transfer. This is due to the fact that TightVNC runs in the backend as a high-privileges account.

Severity

CVSS 3.1

9.0 critical

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

EPSS: 1.1% chance of exploitation in the next 30 days; higher than 65% of CVEs (scores of 2026-10-31)
CWE: CWE-269
Published: 2023-04-12
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

tightvnc:tightvnc

References

https://medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cce
https://www.tightvnc.com/news.php
https://www.tightvnc.com/whatsnew.php
https://medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cce
https://www.tightvnc.com/news.php

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