Is CVE-2018-20023 in the CISA KEV catalog?

No. CVE-2018-20023 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-20023?

CVE-2018-20023 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-20023?

CVE-2018-20023 has an EPSS score of 2.50% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-20023?

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-2018-20023

HIGHEPSS 83th pctl

7.5

CVSS v3

NVD

Description

LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR

CWE-665

How to fix

Remediation Available

libvncserverDebian

Fixed in:0.9.11+dfsg-1.2CVE-2018-20023

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

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

2.50%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Third-Party Advisory4

Other references4

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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.