{"id":"CVE-2021-3516","title":"There's a flaw in libxml2's xmllint in versions before 2.9.11","summary":"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,…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-416"],"vendor":"xmlsoft","product":"xmllint","affected":["xmllint < 2.9.11","debian_linux = 9.0","fedora = 33","fedora = 34","jboss_core_services","enterprise_linux = 6.0","enterprise_linux = 7.0","enterprise_linux = 8.0","clustered_data_ontap","clustered_data_ontap_antivirus_connector","ontap_select_deploy_administration_utility","zfs_storage_appliance_kit = 8.8"],"patched":["xmllint 2.9.11"],"published":"2021-06-01","updated":"2026-10-14","sourceUpdated":"2026-10-14T10:17:42.070","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3516","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1954225","label":"secalert@redhat.com"},{"url":"https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539","label":"secalert@redhat.com"},{"url":"https://gitlab.gnome.org/GNOME/libxml2/-/issues/230","label":"secalert@redhat.com"},{"url":"https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html","label":"secalert@redhat.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/","label":"secalert@redhat.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/","label":"secalert@redhat.com"},{"url":"https://security.gentoo.org/glsa/202107-05","label":"secalert@redhat.com"},{"url":"https://security.netapp.com/advisory/ntap-20210716-0005/","label":"secalert@redhat.com"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1954225","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://gitlab.gnome.org/GNOME/libxml2/-/issues/230","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202107-05","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210716-0005/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.0199,"epssPercentile":0.80108,"ingestedAt":"2026-10-14T10:25:41.191Z","slug":"CVE-2021-3516","body":"## Overview\n\nThere'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.\n\n## Affected\n\n- `xmllint < 2.9.11`\n- `debian_linux = 9.0`\n- `fedora = 33`\n- `fedora = 34`\n- `jboss_core_services`\n- `enterprise_linux = 6.0`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `clustered_data_ontap`\n- `clustered_data_ontap_antivirus_connector`\n- `ontap_select_deploy_administration_utility`\n- `zfs_storage_appliance_kit = 8.8`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `xmllint 2.9.11`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}