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Vulnerability record · CVE-2021-3541 · published 9 July 2021

CVE-2021-3541: Xmlsoft libxml2 vulnerability

Xmlsoft · Libxml2

A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

6.5 CVSS 3.1 Medium EPSS 2.0% · top 20.4% CWE-776 · CWE-776
6.5CVSS 3.1 base score, v2 4.0
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
19Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

19 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1950515 Issue TrackingPatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20210805-0007/ Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1950515 Issue TrackingPatchThird Party Advisory
https://security.netapp.com/advisory/ntap-20210805-0007/ Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3541), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.