Home/CVE/TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate fi
CVE

CVE-2023-27830

TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate fi

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.

CRITICAL · CVSS 9 EPSS 0.00418
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-269Improper Privilege Management
CWE-269Improper Privilege Management
▤

Affected Products & Versions

1
tightvnc< 2.8.75
⚠

Public Exploits & PoCs

1
pocmedium.com · vulnerability-disclosure-privilege-escalation-tightvnc-81...medium.com
▣

Scoring & Timeline

9
CRITICAL · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Apr 2023 · 03:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.tightvnc.com/news.phpProductRelease Notes
https://www.tightvnc.com/whatsnew.phpProductRelease Notes
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