CVE-2021-3516: Debian Linux

High severity, CVSS 7.8. EPSS: 2% chance of exploitation in the next 30 days.

There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.

Affected products

• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 33 only; version 34 only
• Netapp Clustered Data Ontap: affected versions not specified
• Netapp Clustered Data Ontap Antivirus Connector: affected versions not specified
• Netapp Ontap Select Deploy Administration Utility: affected versions not specified
• Oracle ZFS Storage Appliance Kit: version 8.8 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only
• Red Hat JBoss Core Services: affected versions not specified
• Xmlsoft Xmllint: before 2.9.11 (fixed in 2.9.11)

Published 2021-06-01. Last modified 2026-06-17.