What is the CVSS score of CVE-2018-1336?

CVE-2018-1336 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 20.6%.

Is there a patch available for CVE-2018-1336?

Yes, a patch is available for CVE-2018-1336. Update the affected software to the latest version immediately.

Tomcat CVE-2018-1336

HIGH

Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)

2018-08-02 security@apache.org

Denial Of Service Apache Debian Red Hat Tomcat Canonical Debian Linux Enterprise Linux Desktop Enterprise Linux Server Enterprise Linux Workstation Jboss Enterprise Application Platform Ubuntu Linux Jboss Enterprise Web Server

7.5

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-835 ASVS 5.0 V15 - Secure Coding and Architecture Loop termination conditions MITRE ATT&CK 1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity + EPSS > 10%.

Patch available 20.6% exploitation probability (EPSS)

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AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

maven org.apache.tomcat.embed:tomcat-embed-core fix: 7.0.87, 8.0.51, 8.5.31, 9.0.8

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in maven

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-835. 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. Affected products include: Apache Tomcat, Redhat Jboss Enterprise Application Platform, Canonical Ubuntu Linux, Debian Debian Linux, Redhat Jboss Enterprise Web Server.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

DescriptionNVD

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.

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 9.0.0.M9.

Threat Intelligence Overview

EPSS Score

20.6%

Top 3% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 20.6%

Patch available Yes

Active threat No

Deciding rule

HIGH severity + EPSS > 10%

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +21

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc1:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc10:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc2:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc3:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc4:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc5:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc6:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc7:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc8:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:8.0.0:rc9:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:9.0.0:milestone10:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:9.0.0:milestone11:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:9.0.0:milestone12:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:9.0.0:milestone13:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:9.0.0:milestone14:*:*:*:*:*:*

cpe:2.3:a:apache:tomcat:9.0.0:milestone15:*:*:*:*:*:*

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