CVE-2018-20019

highpriority · track · 42EPSS 0.096 · 95 %ileDEEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

9.65% (95th) EPSS

CVSS 7.5 · high

Is it mine?

38 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

LibVNC before commit a83439b9fbe0f03c48eb94ed05729cb016f8b72f contains multiple heap out-of-bound write vulnerabilities in VNC client code that can result remote code execution

remediations

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

A vendor fix is available.

FixedSIMATIC ITC1500 V3siemens_psirt
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1500 V3 PROsiemens_psirt
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1900 V3siemens_psirt
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1900 V3 PROsiemens_psirt
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC2200 V3siemens_psirt
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC2200 V3 PROsiemens_psirt
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1500 V3cisa_csaf_ot
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1500 V3 PROcisa_csaf_ot
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1900 V3cisa_csaf_ot
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC1900 V3 PROcisa_csaf_ot
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC2200 V3cisa_csaf_ot
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
FixedSIMATIC ITC2200 V3 PROcisa_csaf_ot
Update to V3.2.1.0 or later version
https://support.industry.siemens.com/cs/ww/en/view/109804128/
MitigationSIMATIC ITC1500 V3siemens_psirt
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1500 V3 PROsiemens_psirt
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1900 V3siemens_psirt
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1900 V3 PROsiemens_psirt
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC2200 V3siemens_psirt
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC2200 V3 PROsiemens_psirt
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1500 V3cisa_csaf_ot
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1500 V3 PROcisa_csaf_ot
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1900 V3cisa_csaf_ot
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC1900 V3 PROcisa_csaf_ot
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC2200 V3cisa_csaf_ot
Monitor and restrict access to port 5900/tcp to trusted IP addresses only
MitigationSIMATIC ITC2200 V3 PROcisa_csaf_ot
Monitor and restrict access to port 5900/tcp to trusted IP addresses only

cvss

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

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

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:U/RL:O/RC:Csecondary · CISA US

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

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

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-787USprimaryCWE-787USCWE-787USCWE-787US

affected products (38)

Products and version ranges known to be affected.

SIMATIC ITC1500 V3all versionscisa_csaf_otUS
SIMATIC ITC1500 V3 PROall versionscisa_csaf_otUS
SIMATIC ITC1900 V3all versionscisa_csaf_otUS
SIMATIC ITC1900 V3 PROall versionscisa_csaf_otUS
SIMATIC ITC2200 V3all versionscisa_csaf_otUS
SIMATIC ITC2200 V3 PROall versionscisa_csaf_otUS
Siemens SIMATIC ITC1500 V3< V3.2.1.0cisa_csaf_otUS
Siemens SIMATIC ITC1500 V3 PRO< V3.2.1.0cisa_csaf_otUS
Siemens SIMATIC ITC1900 V3< V3.2.1.0cisa_csaf_otUS
Siemens SIMATIC ITC1900 V3 PRO< V3.2.1.0cisa_csaf_otUS
Siemens SIMATIC ITC2200 V3< V3.2.1.0cisa_csaf_otUS
Siemens SIMATIC ITC2200 V3 PRO< V3.2.1.0cisa_csaf_otUS
n/a LibVNC≤ commit a83439b9fbe0f03c48eb94ed05729cb016f8b72fenisa_euvdEU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 18.10fstec_bduRU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 14.04 LTSfstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
Сообщество свободного программного обеспечения LibVNC≤ 0.9.12fstec_bduRU
canonical ubuntu linux= 14.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*

showing 20 of 38

advisories (2)

Vendor and ecosystem advisories describing this.

SSA-390195SSA-390195: LibVNC Vulnerabilities in SIMATIC ITC Products2021-12-14csaf · siemens_psirtDE
Multiple LibVNC vulnerabilities in the affected products listed below could allow remote code execution, information disclosure and Denial-of-Service attacks under certain conditions. Siemens has released updates for the affected products and recommends to update to the latest versions.
ICSA-21-350-12Siemens SIMATIC ITC2021-12-14icsa · cisa_csaf_otUS
Multiple LibVNC vulnerabilities in the affected products listed below could allow remote code execution, information disclosure and Denial-of-Service attacks under certain conditions. Siemens has released updates for the affected products and recommends to update to the latest versions.

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 siemens_psirt NVD CVE.org MITRE

published 2018-12-19modified 2026-06-17

related (16,128)

Related entries.

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CVE-2026-86950US	—OT critical	26.2% (98th)	KEV	2026-09-28
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.11 and iPadOS 18.7.11, iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1,…
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Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security…
CVE-2026-53362US	—OT critical	0.71% (53rd)	KEV	2026-07-04
In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branc…
CVE-2026-53266US	—OT critical	0.93% (61st)	KEV	2026-06-25
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source addre…
CVE-2026-11645US	—OT critical	2.44% (84th)	KEV	2026-06-09
Out of bounds read and write in V8 in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium…

+16123 more

references (36)

External citations — patches, advisories, analysis.

scry

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