CVE-2023-27830

Name: CVE-2023-27830
Creator: NVD / NIST
Published: 2023-04-12T15:15:12.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2023-27830 is a critical-severity vulnerability rated 9/10 on the CVSS scale. 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.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9/10

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

EPSS Probability

1.08%

60.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tightvnc	Tightvnc	< 2.8.75

References

https://medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cceExploit, Third Party Advisory
https://www.tightvnc.com/news.phpProduct, Release Notes
https://www.tightvnc.com/whatsnew.phpProduct, Release Notes
https://medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cceExploit, Third Party Advisory
https://www.tightvnc.com/news.phpProduct, Release Notes
https://www.tightvnc.com/whatsnew.phpProduct, Release Notes

Timeline

Published: Apr 12, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-27830?

How severe is CVE-2023-27830?

CVE-2023-27830 has a CVSS score of 9/10 (CRITICAL severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27830?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27830?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST