CVE & CISA-KEV Catalog

CVE-2018-8034

HIGHEPSS 97th pctl

7.5

CVSS v3

Description

The host name verification when using TLS with the WebSocket client was missing. It is now enabled by default. Versions Affected: Apache Tomcat 9.0.0.M1 to 9.0.9, 8.5.0 to 8.5.31, 8.0.0.RC1 to 8.0.52, and 7.0.35 to 7.0.88.

CWE-295Improper Certificate Validation

How to fix

Remediation Available

tomcatAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-admin-webappsAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-docs-webappAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-el-2.2-apiAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-javadocAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-jsp-2.2-apiAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-jsvcAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-libAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-servlet-3.0-apiAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

tomcat-webappsAmazon

Fixed in:0:7.0.76-10.amzn2.0.1

libtomcat7-javaUbuntu

Fixed in:7.0.52-1ubuntu0.15USN-3723-1

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

libtomcat8-javaUbuntu

Fixed in:8.0.32-1ubuntu1.7USN-3723-1

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

tomcat7Ubuntu

Fixed in:7.0.52-1ubuntu0.15USN-3723-1

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

tomcat8Ubuntu

Fixed in:8.0.32-1ubuntu1.7USN-3723-1

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

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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

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

21.30%probability of exploitation in 30 days

97thpercentile

Very high risk: more likely to be exploited than 97% of all known CVEs.

References

Related Vulnerabilities

Other CWE-295 (Improper Certificate Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-4000	Low	3.7	100%	-	Fix
CVE-2020-0601	High	8.1	89%	KEV	Fix
CVE-2009-3555	Critical	9.8	87%	-	Fix
CVE-2022-26923	High	8.8	84%	KEV	Fix
CVE-2023-27823	Critical	9.8	54%	-	-
CVE-2022-42979	High	8.8	24%	-	-

Common questions

How do I fix CVE-2018-8034?

Published advisories record a fix for 14 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-2018-8034 being actively exploited?

Not that we know of. CVE-2018-8034 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 21.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 97% of all scored CVEs.

How severe is CVE-2018-8034?

CVE-2018-8034 has a CVSS v3 base score of 7.5, rated high. 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-2018-8034 affect?

Published advisories record a fix for tomcat (Amazon), tomcat-admin-webapps (Amazon), tomcat-docs-webapp (Amazon), tomcat-el-2.2-api (Amazon), and 10 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.