Detections
Analytics

Echo: libxml2-2.9.1: security update to 2.9.1+e1

high Tenable Cloud Security Plugin ID 476478

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2021-3517)

Solution

Update the libxml2-2.9.1 library and its related packages to version 2.9.1+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2021-3517

Plugin Details

Severity: High

ID: 476478

Version: Revision 1.1

Type: Local

Published: 10/21/2026

Updated: 10/21/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

Percentile: 96.19

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2021-3517

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/21/2026

Vulnerability Publication Date: 5/19/2021

Reference Information

CVE: CVE-2021-3517