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CVE-2019-8273
CRITICAL
UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file transfer request handler, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1212.
Published: Mar 8, 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-f693-2xf3-fcpc
UltraVNC revision 1211 has a heap buffer overflow vulnerability in VNC server code inside file...
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-19-020-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-19-020-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
8.26%
Top 6% most likely to be exploited
Threat Score
41.7 / 100
Data Sources
NVD
EPSS
GitHub