CVE-2023-27830 json
TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating system via replacing legitimate files with crafted fi…
published 2023-04-12 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-31566
- cvss
- 9.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- tightvnc tightvnc 2.8.75
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 21 mo ago
Exploit prediction
1.08% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- medium.com https://medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cce referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| CNA | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
Classification
- Weakness
-
- CWE-269 Improper Privilege Management
References
-
medium.com
/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cce
exploit, third-party-advisory
-
tightvnc.com
/whatsnew.php
product, release-notes
-
tightvnc.com
/news.php
product, release-notes
Sources
- CVE List CVE-2023-27830
- NVD CVE-2023-27830
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