{"id":"CVE-2021-3537","title":"A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference","summary":"A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, t…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476","CWE-476"],"vendor":"xmlsoft","product":"libxml2","affected":["libxml2 < 2.9.11","jboss_core_services","enterprise_linux = 6.0","enterprise_linux = 7.0","enterprise_linux = 8.0","debian_linux = 9.0","fedora = 33","fedora = 34","active_iq_unified_manager","clustered_data_ontap","clustered_data_ontap_antivirus_connector","manageability_software_development_kit","ontap_select_deploy_administration_utility","snapdrive","hci_h410c_firmware","communications_cloud_native_core_network_function_cloud_native_environment = 1.10.0","enterprise_manager_base_platform = 13.4.0.0","enterprise_manager_base_platform = 13.5.0.0","enterprise_manager_ops_center = 12.4.0.0","mysql_workbench <= 8.0.26","openjdk = 8","peoplesoft_enterprise_peopletools = 8.58","real_user_experience_insight = 13.4.1.0","real_user_experience_insight = 13.5.1.0"],"patched":["libxml2 2.9.11"],"published":"2021-05-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T10:17:45.043","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3537","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1956522","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-20210625-0002/","label":"secalert@redhat.com"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"secalert@redhat.com"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"secalert@redhat.com"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1956522","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-20210625-0002/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.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":0.03503,"epssPercentile":0.88906,"ingestedAt":"2026-10-14T10:25:41.189Z","slug":"CVE-2021-3537","body":"## Overview\n\nA vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.\n\n## Affected\n\n- `libxml2 < 2.9.11`\n- `jboss_core_services`\n- `enterprise_linux = 6.0`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `debian_linux = 9.0`\n- `fedora = 33`\n- `fedora = 34`\n- `active_iq_unified_manager`\n- `clustered_data_ontap`\n- `clustered_data_ontap_antivirus_connector`\n- `manageability_software_development_kit`\n- `ontap_select_deploy_administration_utility`\n- `snapdrive`\n- `hci_h410c_firmware`\n- `communications_cloud_native_core_network_function_cloud_native_environment = 1.10.0`\n- `enterprise_manager_base_platform = 13.4.0.0`\n- `enterprise_manager_base_platform = 13.5.0.0`\n- `enterprise_manager_ops_center = 12.4.0.0`\n- `mysql_workbench <= 8.0.26`\n- `openjdk = 8`\n- `peoplesoft_enterprise_peopletools = 8.58`\n- `real_user_experience_insight = 13.4.1.0`\n- `real_user_experience_insight = 13.5.1.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libxml2 2.9.11`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.7,"exploitation":0,"ransomware":0},"changes":[]}