libexpatproject libexpat CVE-2018-20843 vulnerability in Libexpatproject and Other Products
Published on June 24, 2019

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In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

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Vulnerability Analysis

CVE-2018-20843 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is a XXE Vulnerability?

The software processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

CVE-2018-20843 has been classified to as a XXE vulnerability or weakness.


Products Associated with CVE-2018-20843

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2018-20843 are published in these products:

Libexpatproject Libexpat
 
Oracle Outside In Technology
 
Canonical Ubuntu Linux
 
Debian Linux
 
Fedora Project Fedora
 
OpenSuse Leap
 
Oracle Hospitality Res 3700
 
Oracle Http Server
 
Tenable Nessus
 

Exploit Probability

EPSS
5.83%
Percentile
90.31%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.