🛡️ CVE-2023-27830 — tightvnc

🔴 CVSS 9.0 — Critical ⚠️ Exploit Public CWE-269 NVD
9.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2023-27830 is classified as CWE-269: Improper Privilege Management. Privileges are assigned, dropped or restored incorrectly, leaving an actor with more access than intended.

Affected software

CVE-2023-27830 is recorded against 1 package.

  • tightvnc (fixed in 2.8.75)

Timeline and source

Published on 12 April 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

medium.com
www.tightvnc.com
www.tightvnc.com
medium.com
www.tightvnc.com
www.tightvnc.com

Details

Severity CRITICAL
CVSS Score 9.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CWE CWE-269
Public Exploit ⚠️ Yes
Source NVD
Published 2023-04-12
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
tightvnc — 2.8.75

Exploit Protection

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CVE-2023-27830 carries CVSS 9.0 Critical rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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