Apache Tomcat up to 7.0.86/8.0.51/8.5.30/9.0.7 UTF-8 Decoder resource consumption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
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A vulnerability, which was classified as problematic, was found in Apache Tomcat up to 7.0.86/8.0.51/8.5.30/9.0.7 (Application Server Software). Affected is an unknown function of the component UTF-8 Decoder. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-400. This is going to have an impact on availability.

The bug was discovered 04/06/2018. The weakness was released 08/02/2018 (Website). The advisory is shared for download at mail-archives.us.apache.org. This vulnerability is traded as CVE-2018-1336 since 12/06/2017. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/12/2020). The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability was handled as a non-public zero-day exploit for at least 118 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 112185 (Debian DSA-4281-1 : tomcat8 - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context local. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197211 (Ubuntu Security Notification for Tomcat7, Tomcat8 Vulnerabilities (USN-3723-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at SecurityFocus (BID 104898) and Tenable (112185). Entries connected to this vulnerability are available at 117151 and 122531.





CPE 2.3infoedit

CPE 2.2infoedit


VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍



VulDB Base Score: 🔍
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NVD Base Score: 🔍


Class: Denial of service
CWE: CWE-400
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 112185
Nessus Name: Debian DSA-4281-1 : tomcat8 - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfoedit

Threat: 🔍
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Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: mail-archives.us.apache.org


12/06/2017 🔍
04/06/2018 +120 days 🔍
07/22/2018 +107 days 🔍
08/02/2018 +10 days 🔍
08/02/2018 +0 days 🔍
08/03/2018 +1 days 🔍
08/29/2018 +26 days 🔍
08/30/2018 +1 days 🔍
03/12/2020 +560 days 🔍


Vendor: https://www.apache.org/

Advisory: mail-archives.us.apache.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-1336 (🔍)

SecurityFocus: 104898 - Apache Tomcat CVE-2018-1336 Denial of Service Vulnerability

See also: 🔍


Created: 08/03/2018 07:32 AM
Updated: 03/12/2020 09:08 PM
Changes: (6) vulnerability_discoverydate advisory_confirm_url countermeasure_name countermeasure_date source_securityfocus_date source_securityfocus_class
Complete: 🔍


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