TI-2023-12438 Aliases CVE-2023-27830 GHSA-w347-2542-wgjq

TightVNC before v2.8.75 allows attackers to escalate privileges on the host operating…

MEDIUM 43CWE-269Published 2023-04-12 · Updated 2025-02-08

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Privilege escalation
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-269.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01078 65th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tightvnc:tightvnc::::::::	before 2.8.75	Vulnerable	Tightvnc

cpe:2.3:a:tightvnc:tightvnc:*:*:*:*:*:*:*:* Versions before 2.8.75 Vulnerable ·Tightvnc

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2023-27830
2026-10-03 Alias added: GHSA-w347-2542-wgjq

References

Exploit 1

https://medium.com/nestedif/vulnerability-disclosure-privilege-escalation-tightvnc-8165208cce

Other 2

TI-2019-05957 Buffer overflow in Kaspersky TightVNC CVSS 3.1CRITICAL 9.8
TI-2009-00368 Multiple integer signedness errors in (1) UltraVNC 1.0.2 and 1.0.5 and (2) TightVnc 1.3.9… CVSS 2.0HIGH 10.0
TI-2019-11763 Heap-based buffer overflow in Kaspersky TightVNC CVSS 3.1CRITICAL 9.8
TI-2019-11762 Heap-based buffer overflow in Kaspersky TightVNC CVSS 3.1CRITICAL 9.8
TI-2021-18987 Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59 CVSS 3.1CRITICAL 9.8
TI-2019-11764 NULL pointer dereference in Kaspersky TightVNC CVSS 3.1HIGH 7.5

See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences