CVE-2019-8268

highpriority · track · 40EPSS 0.039 · 90 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.92% (90th) EPSS

CVSS 7.5 · high

Is it mine?

13 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

UltraVNC revision 1206 has multiple off-by-one vulnerabilities in VNC client code connected with improper usage of ClientConnection::ReadString function, which can potentially result code execution. This attack appears to be exploitable via network connectivity. These vulnerabilities have been fixed in revision 1207.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSINUMERIK Access MyMachine /P2Pcisa_csaf_ot
Update to V4.8
FixedSINUMERIK PCU base Win10 software /IPCcisa_csaf_ot
Update to V14.00
FixedSINUMERIK PCU base Win7 software /IPCcisa_csaf_ot
Update to V12.01 HF4
MitigationSINUMERIK Access MyMachine /P2Pcisa_csaf_ot
Restrict access to the device to the internal or VPN network and to trusted IP addresses only.
MitigationSINUMERIK PCU base Win10 software /IPCcisa_csaf_ot
Restrict access to the device to the internal or VPN network and to trusted IP addresses only.
MitigationSINUMERIK PCU base Win7 software /IPCcisa_csaf_ot
Restrict access to the device to the internal or VPN network and to trusted IP addresses only.

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–10

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:Csecondary · CISA US

v3.110criticalAV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-193USprimaryCWE-193USCWE-193USCWE-682US

affected products (13)

Products and version ranges known to be affected.

Siemens SINUMERIK Access MyMachine /P2P: All versions < V4.8all versionscisa_csaf_otUS
Siemens SINUMERIK PCU base Win10 software /IPC: All versions < V14.00all versionscisa_csaf_otUS
Siemens SINUMERIK PCU base Win7 software /IPC: All versions < V12.01 HF4all versionscisa_csaf_otUS
Siemens SINUMERIK Access MyMachine /P2P< V4.8cisa_csaf_otUS
Siemens SINUMERIK PCU base Win10 software /IPC< V14.00cisa_csaf_otUS
Siemens SINUMERIK PCU base Win7 software /IPC< V12.01_HF4cisa_csaf_otUS
Kaspersky Lab UltraVNC≤ 1.2.2.3enisa_euvdEU
Schneider Electric TelevisGoall versionsfstec_bduRU
Team UltraVNC UltraVNC≤ 1.2.2.3fstec_bduRU
siemens sinumerik access mymachine/p2p< 4.8nvdUScpe:2.3:a:siemens:sinumerik_access_mymachine\/p2p:*:*:*:*:*:*:*:*
siemens sinumerik pcu base win10 software/ipc< 14.00nvdUScpe:2.3:a:siemens:sinumerik_pcu_base_win10_software\/ipc:*:*:*:*:*:*:*:*
siemens sinumerik pcu base win7 software/ipc≤ 12.01nvdUScpe:2.3:a:siemens:sinumerik_pcu_base_win7_software\/ipc:*:*:*:*:*:*:*:*
uvnc ultravnc< 1.2.2.3nvdUScpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-20-161-06Siemens SINUMERIK2020-06-09icsa · cisa_csaf_otUS
As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd NVD CVE.org MITRE

published 2019-03-08modified 2026-06-17

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+326 more

references (13)

External citations — patches, advisories, analysis.

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