CVE & CISA-KEV Catalog

CVE-2018-1336

HIGHEPSS 97th pctl

7.5

CVSS v3

Description

An improper handing of overflow in the UTF-8 decoder with supplementary characters can lead to an infinite loop in the decoder causing a Denial of Service. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.7, 8.5.0 to 8.5.30, 8.0.0.RC1 to 8.0.51, and 7.0.28 to 7.0.86.

How to fix

Remediation Available

tomcatAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-admin-webappsAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-docs-webappAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-el-2.2-apiAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-javadocAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-jsp-2.2-apiAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-jsvcAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-libAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-servlet-3.0-apiAmazon

Fixed in:0:7.0.76-8.amzn2

tomcat-webappsAmazon

Fixed in:0:7.0.76-8.amzn2

libservlet3.0-javaUbuntu

Fixed in:7.0.68-1ubuntu0.4+esm1USN-4791-1

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

libtomcat7-javaUbuntu

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

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

Fixed in:7.0.68-1ubuntu0.4+esm1USN-4791-1

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

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.

Fixed in:7.0.68-1ubuntu0.4+esm1USN-4791-1

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

tomcat7-adminUbuntu

Fixed in:7.0.68-1ubuntu0.4+esm1USN-4791-1

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

tomcat7-commonUbuntu

Fixed in:7.0.68-1ubuntu0.4+esm1USN-4791-1

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

tomcat7-userUbuntu

Fixed in:7.0.68-1ubuntu0.4+esm1USN-4791-1

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

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

20.60%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-835 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13935	High	7.5	87%	-	Fix
CVE-2020-36227	High	7.5	78%	-	Fix
CVE-2022-0778	High	7.5	73%	-	Fix
CVE-2024-20353	High	8.6	71%	KEV	-
CVE-2019-14241	High	7.5	70%	-	-
CVE-2017-16944	High	7.5	63%	-	Fix

Common questions

How do I fix CVE-2018-1336?

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-2018-1336 being actively exploited?

Not that we know of. CVE-2018-1336 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 20.6% 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-2018-1336?

CVE-2018-1336 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-2018-1336 affect?

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