CVE & CISA-KEV Catalog

CVE-2018-14599

CRITICALEPSS 91th pctl
9.8
CVSS v3
NVD

Description

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c is vulnerable to an off-by-one error caused by malicious server responses, leading to DoS or possibly unspecified other impact.

CWE-193

How to fix

Remediation Available
libX11Amazon
Fixed in:0:1.6.5-2.amzn2.0.2
Fixed in:0:1.6.5-2.amzn2.0.2
Fixed in:0:1.6.5-2.amzn2.0.2
libX11-commonAmazon
Fixed in:0:1.6.5-2.amzn2.0.2
libX11-debuginfoAmazon
Fixed in:0:1.6.5-2.amzn2.0.2
Fixed in:0:1.6.5-2.amzn2.0.2
Fixed in:0:1.6.5-2.amzn2.0.2
libX11-develAmazon
Fixed in:0:1.6.5-2.amzn2.0.2
Fixed in:0:1.6.5-2.amzn2.0.2
Fixed in:0:1.6.5-2.amzn2.0.2
xorg-x11-server-XdmxAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-XephyrAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-XnestAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-XorgAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-XvfbAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-XwaylandAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-commonAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-debuginfoAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-develAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
Fixed in:0:1.20.4-7.amzn2.0.1
xorg-x11-server-sourceAmazon
Fixed in:0:1.20.4-7.amzn2.0.1
libx11Debian
Fixed in:2:1.6.6-1CVE-2018-14599
Fixed in:2:1.6.6-1CVE-2018-14599
Fixed in:2:1.6.6-1CVE-2018-14599
libx11Ubuntu
Fixed in:2:1.6.2-1ubuntu2.1USN-3758-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2:1.6.3-1ubuntu2.1USN-3758-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2:1.6.4-3ubuntu0.1USN-3758-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

libx11-6Ubuntu
Fixed in:2:1.6.2-1ubuntu2.1USN-3758-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2:1.6.3-1ubuntu2.1USN-3758-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2:1.6.4-3ubuntu0.1USN-3758-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

libx11-devUbuntu
Fixed in:2:1.6.2-1ubuntu2.1USN-3758-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2:1.6.3-1ubuntu2.1USN-3758-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2:1.6.4-3ubuntu0.1USN-3758-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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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

4.80%probability of exploitation in 30 days
91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Other references1

Related Vulnerabilities

Other CWE-193 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2021-3156High7.8100%KEVFix
CVE-2003-0466Critical9.878%--
CVE-2023-44444High7.856%-Fix
CVE-2021-23017High7.753%-Fix
CVE-2023-28709High7.548%-Fix
CVE-2018-8828Critical9.830%-Fix

Common questions

How do I fix CVE-2018-14599?

Published advisories record a fix for 18 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-14599 being actively exploited?

Not that we know of. CVE-2018-14599 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 4.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 91% of all scored CVEs.

How severe is CVE-2018-14599?

CVE-2018-14599 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-14599 affect?

Published advisories record a fix for libX11 (Amazon), libX11-common (Amazon), libX11-debuginfo (Amazon), libX11-devel (Amazon), and 14 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2026-06-17.