xmlsoft libxml2 CVE-2021-3517 vulnerability in Xmlsoft and Other Products
Published on May 19, 2021

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There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with some potential impact to confidentiality and integrity if an attacker is able to use memory information to further exploit the application.

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Weakness Type

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2021-3517 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2021-3517

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Vulnerable Packages

The following package name and versions may be associated with CVE-2021-3517

Package Manager Vulnerable Package Versions Fixed In
rubygems nokogiri < 1.11.4 1.11.4

Exploit Probability

EPSS
1.20%
Percentile
77.16%

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.