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CVE-2019-8258
CRITICAL
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.
Published: Mar 5, 2019
Modified: Jun 17, 2026
CWE-122
CWE-787
CVSS Metrics
CVSSv3
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (4)
| Vendor | Product | Version |
|---|---|---|
| uvnc | ultravnc | * < 1.2.2.3 |
| siemens | sinumerik_access_mymachine\/p2p | * < 4.8 |
| siemens | sinumerik_pcu_base_win10_software\/ipc | * < 14.00 |
| siemens | sinumerik_pcu_base_win7_software\/ipc | * |
GitHub Security Advisory GHSA-gvjj-vw6c-72cq
UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results...
References (6)
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf Third Party Advisory
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-004-ultravnc-heap-based-buffer-overflow/ Third Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06 Third Party Advisory, US Government Resource
- https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdf Third Party Advisory
- https://ics-cert.kaspersky.com/advisories/klcert-advisories/2019/03/01/klcert-19-004-ultravnc-heap-based-buffer-overflow/ Third Party Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-161-06 Third Party Advisory, US Government Resource
Risk Scores
CVSS Score
9.8 / 10
EPSS Score
4.43%
Top 9% most likely to be exploited
Threat Score
40.5 / 100
Data Sources
NVD
EPSS
GitHub