Is CVE-2018-20020 in the CISA KEV catalog?

No. CVE-2018-20020 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-20020?

CVE-2018-20020 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-20020?

CVE-2018-20020 has an EPSS score of 8.55% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-20020?

Upgrade libvncserver on debian 11 to 0.9.11+dfsg-1.2 or later. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2018-20020

CRITICALEPSS 94th pctl

9.8

CVSS v3

NVD

Description

LibVNC before commit 7b1ef0ffc4815cab9a96c7278394152bdc89dc4d contains heap out-of-bound write vulnerability inside structure 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-2018-20020

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

ssvncUbuntu

Fixed in:1.0.29-2+deb8u1build0.16.04.1USN-4547-2

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

Exploit Intelligence

8.55%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Third-Party Advisory4

Other references7

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.