TI-2018-10923 Aliases CVE-2018-15361 GHSA-5g7c-7pq7-39h8

Out-of-bounds write in UltraVNC

MEDIUM 47CWE-124Published 2019-03-05 · Updated 2024-09-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

UltraVNC revision 1198 has a buffer underflow vulnerability in VNC client code, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.

Why it matters now

EPSS 0.02876 86th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
UltraVNC	UltraVNC	1.2.2.3	—	No fix listed	CNA

UltraVNC VendorUltraVNC Affected 1.2.2.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:uvnc:ultravnc::::::::	before 1.2.2.3	Vulnerable	uvnc

cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:* Versions before 1.2.2.3 Vulnerable ·uvnc

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2018-15361
2026-10-03 Alias added: GHSA-5g7c-7pq7-39h8

References

Advisory 1

https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-003-ultravnc-buffer-underwrite/

Other 2

TI-2006-01599 Multiple buffer overflows in (a) UltraVNC (aka Ultr@VNC) 1.0.1 and earlier and (b)… CVSS 2.0HIGH 9.0
TI-2008-00582 Stack-based buffer overflow in the ClientConnection::NegotiateProtocolVersion function in… CVSS 2.0HIGH 9.3
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-2019-05934 Heap-based buffer overflow in UltraVNC CVSS 3.1CRITICAL 9.8
TI-2019-05930 Heap-based buffer overflow in UltraVNC CVSS 3.1CRITICAL 9.8
TI-2008-04755 Multiple stack-based buffer overflows in multiple functions in vncviewer/FileTransfer.cpp… CVSS 2.0HIGH 9.3

See all 13 →

Sources

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