{"cve_id":"CVE-2021-3156","published":"2021-01-26T21:15:12.987000+00:00","last_modified":"2026-06-17T04:04:45.830000+00:00","vuln_status":"Analyzed","description":"Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via \"sudoedit -s\" and a command-line argument that ends with a single backslash character.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","base_score":7.8,"base_severity":"HIGH","attack_vector":"LOCAL","privileges_req":"LOW","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-193"],"in_kev":true,"kev_date_added":"2022-04-06","kev_ransomware":false,"epss_score":0.99962,"epss_percentile":0.99976,"cap_rule_version":"0.1.1","stage":"EXECUTION","req_access":"USER","req_vector":"LOCAL","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:30:19.443689+00:00","first_seen":"2021-01-26T21:15:12.987000+00:00","kev_first_seen":"2022-04-06T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["beyondtrust","debian","fedoraproject","mcafee","netapp","oracle","sudo_project","synology"],"products":["active_iq_unified_manager","cloud_backup","communications_performance_intelligence_center","debian_linux","diskstation_manager","diskstation_manager_unified_controller","fedora","hci_management_node","micros_compact_workstation_3","micros_compact_workstation_3_firmware","micros_es400","micros_es400_firmware","micros_kitchen_display_system","micros_kitchen_display_system_firmware","micros_workstation_5a","micros_workstation_5a_firmware","micros_workstation_6","micros_workstation_6_firmware","oncommand_unified_manager_core_package","ontap_select_deploy_administration_utility","ontap_tools","privilege_management_for_mac","privilege_management_for_unix\\/linux","skynas","skynas_firmware","solidfire","sudo","tekelec_platform_distribution","vs960hd","vs960hd_firmware","web_gateway"],"affected":[{"vendor":"beyondtrust","product":"privilege_management_for_mac","ranges":["< 21.1.1"]},{"vendor":"beyondtrust","product":"privilege_management_for_unix\\/linux","ranges":["< 10.3.2-10"]},{"vendor":"debian","product":"debian_linux","ranges":["10.0","9.0"]},{"vendor":"fedoraproject","product":"fedora","ranges":["32","33"]},{"vendor":"mcafee","product":"web_gateway","ranges":["9.2.8","10.0.4","8.2.17"]},{"vendor":"netapp","product":"active_iq_unified_manager","ranges":["all versions"]},{"vendor":"netapp","product":"cloud_backup","ranges":["all versions"]},{"vendor":"netapp","product":"hci_management_node","ranges":["all versions"]},{"vendor":"netapp","product":"oncommand_unified_manager_core_package","ranges":["all versions"]},{"vendor":"netapp","product":"ontap_select_deploy_administration_utility","ranges":["all versions"]},{"vendor":"netapp","product":"ontap_tools","ranges":["9"]},{"vendor":"netapp","product":"solidfire","ranges":["all versions"]},{"vendor":"oracle","product":"communications_performance_intelligence_center","ranges":["≥ 10.3.0.0.0 and ≤ 10.3.0.2.1","≥ 10.4.0.1.0 and ≤ 10.4.0.3.1"]},{"vendor":"oracle","product":"micros_compact_workstation_3_firmware","ranges":["310"]},{"vendor":"oracle","product":"micros_es400_firmware","ranges":["≥ 400 and ≤ 410"]},{"vendor":"oracle","product":"micros_kitchen_display_system_firmware","ranges":["210"]},{"vendor":"oracle","product":"micros_workstation_5a_firmware","ranges":["5a"]},{"vendor":"oracle","product":"micros_workstation_6_firmware","ranges":["≥ 610 and ≤ 655"]},{"vendor":"oracle","product":"tekelec_platform_distribution","ranges":["≥ 7.4.0 and ≤ 7.7.1"]},{"vendor":"sudo_project","product":"sudo","ranges":["≥ 1.8.2 and < 1.8.32","≥ 1.9.0 and < 1.9.5","1.9.5"]},{"vendor":"synology","product":"diskstation_manager","ranges":["6.2"]},{"vendor":"synology","product":"diskstation_manager_unified_controller","ranges":["3.0"]},{"vendor":"synology","product":"skynas_firmware","ranges":["all versions"]},{"vendor":"synology","product":"vs960hd_firmware","ranges":["all versions"]}]}