{"cve_id":"CVE-2021-20038","published":"2021-12-08T10:15:07.750000+00:00","last_modified":"2026-06-17T03:33:11.327000+00:00","vuln_status":"Analyzed","description":"A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-121","CWE-787"],"in_kev":true,"kev_date_added":"2022-01-28","kev_ransomware":true,"epss_score":0.99912,"epss_percentile":0.99967,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T09:53:54.929472+00:00","first_seen":"2021-12-08T10:15:07.750000+00:00","kev_first_seen":"2022-01-28T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["sonicwall"],"products":["sma_200","sma_200_firmware","sma_210","sma_210_firmware","sma_400","sma_400_firmware","sma_410","sma_410_firmware","sma_500v","sma_500v_firmware"],"affected":[{"vendor":"sonicwall","product":"sma_200_firmware","ranges":["10.2.0.8-37sv","10.2.1.2-24sv","10.2.1.1-19sv"]},{"vendor":"sonicwall","product":"sma_210_firmware","ranges":["10.2.0.8-37sv","10.2.1.1-19sv","10.2.1.2-24sv"]},{"vendor":"sonicwall","product":"sma_400_firmware","ranges":["10.2.0.8-37sv","10.2.1.2-24sv","10.2.1.1-19sv"]},{"vendor":"sonicwall","product":"sma_410_firmware","ranges":["10.2.1.2-24sv","10.2.0.8-37sv","10.2.1.1-19sv"]},{"vendor":"sonicwall","product":"sma_500v_firmware","ranges":["10.2.0.8-37sv","10.2.1.1-19sv","10.2.1.2-24sv"]}]}