Heap-based buffer overflow in UltraVNC
Priority MEDIUM 49CWE-122Published · Updated
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 3.1 · NVD. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.
Summary
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1199.
Why it matters now
EPSS 0.04434 91st 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 · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:* | before 1.2.2.3 | Vulnerable | uvnc |
| cpe:2.3:a:siemens:sinumerik_access_mymachine\/p2p:*:*:*:*:*:*:*:* | before 4.8 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:sinumerik_pcu_base_win10_software\/ipc:*:*:*:*:*:*:*:* | before 14.00 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:sinumerik_pcu_base_win7_software\/ipc:*:*:*:*:*:*:*:* | up to 12.01 | Vulnerable | Siemens |
- cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:* Versions before 1.2.2.3 Vulnerable ·uvnc
- cpe:2.3:a:siemens:sinumerik_access_mymachine\/p2p:*:*:*:*:*:*:*:* Versions before 4.8 Vulnerable ·Siemens
- cpe:2.3:a:siemens:sinumerik_pcu_base_win10_software\/ipc:*:*:*:*:*:*:*:* Versions before 14.00 Vulnerable ·Siemens
- cpe:2.3:a:siemens:sinumerik_pcu_base_win7_software\/ipc:*:*:*:*:*:*:*:* Versions up to 12.01 Vulnerable ·Siemens
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-8258
- 2026-10-03 Alias added: GHSA-gvjj-vw6c-72cq
References
More UltraVNC vulnerabilities
- 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-2008-04755 Multiple stack-based buffer overflows in multiple functions in vncviewer/FileTransfer.cpp… CVSS 2.0HIGH 9.3
- TI-2018-10923 Out-of-bounds write in UltraVNC CVSS 3.0CRITICAL 9.8
Sources
- CVE-2019-8258 · CVE Program
- CVE-2019-8258 · NVD
- FIRST EPSS
- GHSA-gvjj-vw6c-72cq · GitHub Advisory Database · CC BY 4.0
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