Home/CVE/UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This at
CVE

CVE-2019-8258

UltraVNC revision 1198 has a heap buffer overflow vulnerability in VNC client code which results code execution. This at

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.

CRITICAL · CVSS 9.8 EPSS 0.04
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules2 YARA rules0
⬡

Weakness Classification

CWE-122Heap-based Buffer Overflow
CWE-787Out-of-bounds Write
▤

Affected Products & Versions

4
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<= 12.01
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious UltraVNC Execution
productmediumUse of UltraVNC Remote Access Software
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · vulnerability@kaspersky.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD05 Mar 2019 · 03:29 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

1
cisa-csafcisa-csaf-csaf_files-OT-white-2020-icsa-20-161-06
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cert-portal.siemens.com/productcert/pdf/ssa-927095.pdfThird 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-20-161-06Third Party AdvisoryUS Government Resource
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