CVE-2023-27830: tightvnc Improper Privilege Management
CVSS: 9.0v3.1CriticalModified
Published 12-04-2023Last modified 08-02-2025
Vulnerability summary
CVE-2023-27830 is a critical (CVSS 9.0) Improper Privilege Management vulnerability in tightvnc. EPSS estimates a 1.08% chance of exploitation in the next 30 days, higher than 64.5% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.0/10
010
Critical · v3.1 (CVE.org)EPSS score
1.08%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 12-04-2023PublishedVulnerability first disclosed.
- 08-02-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.0Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST9.0CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
EPSS trend
Probability
1.08%
Chance of exploitation in the next 30 days
Percentile
65%
Versus all other CVEs
30-day change
0.00 pp
From 1.08% on 20-09-2026
20-09-202620-10-2026
EPSS score1.08%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (medium.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Tightvnc1 product
- tightvnc< 2.8.75
1 vendor · 1 product
References
3 links- medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cceExploitThird Party Advisory