Is CVE-2018-20019 in the CISA KEV catalog?

No. CVE-2018-20019 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-20019?

CVE-2018-20019 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-20019?

CVE-2018-20019 has an EPSS score of 9.39% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-20019?

Upgrade libvncserver on debian 11 to 0.9.11+dfsg-1.2 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2018-20019

CRITICALEPSS 95th pctl

9.8

CVSS v3

NVD

Description

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

CWE-787Out-of-bounds Write

How to fix

Remediation Available

libvncserverDebian

Fixed in:0.9.11+dfsg-1.2CVE-2018-20019

italcUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

Fixed in:1:3.0.3+dfsg1-3ubuntu0.1USN-4547-1

italc-clientUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

Fixed in:1:3.0.3+dfsg1-3ubuntu0.1USN-4547-1

italc-masterUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

Fixed in:1:3.0.3+dfsg1-3ubuntu0.1USN-4547-1

libitalccoreUbuntu

Fixed in:1:2.0.2+dfsg1-4ubuntu0.1USN-4587-1

Fixed in:1:3.0.3+dfsg1-3ubuntu0.1USN-4547-1

libvncclient1Ubuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.3USN-3877-1

Fixed in:0.9.11+dfsg-1ubuntu1.1USN-3877-1

libvncserverUbuntu

Fixed in:0.9.9+dfsg-1ubuntu1.4USN-3877-1

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.3USN-3877-1

Fixed in:0.9.11+dfsg-1ubuntu1.1USN-3877-1

libvncserver0Ubuntu

Fixed in:0.9.9+dfsg-1ubuntu1.4USN-3877-1

libvncserver1Ubuntu

Fixed in:0.9.10+dfsg-3ubuntu0.16.04.3USN-3877-1

Fixed in:0.9.11+dfsg-1ubuntu1.1USN-3877-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

9.39%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Patch1

cert-portal.siemens.com

Third-Party Advisory7

Other references1

ics-cert.kaspersky.com

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.