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Fencer Intel
critical 9.8

CVE-2019-8264 json

UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder, which can potentially result in code exe…

published 7y ago modified 4mo ago also EUVD-2019-17662

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

UltraVNC revision 1203 has out-of-bounds access vulnerability in VNC client inside Ultra2 decoder, which can potentially result in code execution. This attack appears to be exploitable via network connectivity. This vulnerability has been fixed in revision 1204.

Patch / fix

  • uvnc ultravnc 1.2.2.3

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-131-04 updated cvss 9.8

Siemens SINAMICS Medium Voltage Products Remote Access (Update B)

  • Siemens SINAMICS GH150 Siemens SINAMICS GL150 (with option X30) Siemens SINAMICS GM150 (with option X30) Siemens SINAMICS SH150 Siemens SINAMICS SL150 Siemens SINAMICS SM120
    +2 more products
    Siemens SINAMICS SM150 Siemens SINAMICS SM150i
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-21-131-11 updated cvss 9.8

Siemens SIMATIC UltraVNC HMI WinCC Products

  • Siemens SIMATIC HMI Comfort Outdoor Panels 7" & 15" (incl. SIPLUS variants) <V16_Update_4 Siemens SIMATIC HMI Comfort Panels 4" - 22" (incl. SIPLUS variants) <V16_Update_4 Siemens SIMATIC HMI KTP Mobile Panels KTP400F, KTP700, KTP700F, KTP900 and KTP900F <V16_Update_4
    affected: fixed in V16, mitigation support.industry.siemens.com
  • Siemens SIMATIC WinCC Runtime Advanced <V16_Update_4
    affected: fixed in V16, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-20-161-06 updated cvss 9.8

Siemens SINUMERIK

  • Siemens SINUMERIK Access MyMachine /P2P <V4.8
    affected: fixed in V4.8, mitigation
  • Siemens SINUMERIK PCU base Win7 software /IPC <V12.01_HF4
    affected: fixed in V12.01, mitigation
  • Siemens SINUMERIK PCU base Win10 software /IPC <V14.00
    affected: fixed in V14.00, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

3.13% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Kaspersky Lab UltraVNC

Classification

Weakness
  • CWE-788 Access of Memory Location After End of Buffer
  • CWE-125 Out-of-bounds Read
  • CWE-787 Out-of-bounds Write

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.