{"id":"CVE-2021-3541","title":"A flaw was found in libxml2","summary":"A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-776"],"vendor":"xmlsoft","product":"libxml2","affected":["libxml2 < 2.9.11","jboss_core_services","zfs_storage_appliance_kit = 8.8","active_iq_unified_manager","cloud_backup","clustered_data_ontap","clustered_data_ontap_antivirus_connector","manageability_software_development_kit","ontap_select_deploy_administration_utility","smi-s_provider","snapdrive","h410c_firmware","h300s_firmware","h500s_firmware","h700s_firmware","h300e_firmware","h500e_firmware","h700e_firmware","h410s_firmware"],"patched":["libxml2 2.9.11"],"published":"2021-07-09","updated":"2026-10-14","sourceUpdated":"2026-10-14T10:17:45.397","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-3541","references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1950515","label":"secalert@redhat.com"},{"url":"https://security.netapp.com/advisory/ntap-20210805-0007/","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=1950515","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210805-0007/","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":0.01964,"epssPercentile":0.79842,"ingestedAt":"2026-10-14T10:25:41.191Z","slug":"CVE-2021-3541","body":"## Overview\n\nA flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.\n\n## Affected\n\n- `libxml2 < 2.9.11`\n- `jboss_core_services`\n- `zfs_storage_appliance_kit = 8.8`\n- `active_iq_unified_manager`\n- `cloud_backup`\n- `clustered_data_ontap`\n- `clustered_data_ontap_antivirus_connector`\n- `manageability_software_development_kit`\n- `ontap_select_deploy_administration_utility`\n- `smi-s_provider`\n- `snapdrive`\n- `h410c_firmware`\n- `h300s_firmware`\n- `h500s_firmware`\n- `h700s_firmware`\n- `h300e_firmware`\n- `h500e_firmware`\n- `h700e_firmware`\n- `h410s_firmware`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `libxml2 2.9.11`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}