{"id":"CVE-2021-20038","aliases":[],"url":"https://o3.security/vulnerability/CVE-2021-20038","summary":"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…","details":"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.","published":"2021-12-08T10:15:07.750","modified":"2026-06-17T03:33:11.327","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.99912,"percentile":0.99966,"asOf":"2026-08-27"},"cisaKev":{"dateAdded":"2022-01-28","dueDate":"2022-02-11","knownRansomwareCampaignUse":true},"exploitsKnown":8,"affectedPackages":[],"fix":null,"references":[{"type":"EXPLOIT","url":"https://github.com/jbaines-r7/badblood"},{"type":"ADVISORY","url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026"},{"type":"EXPLOIT","url":"https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/"},{"type":"EXPLOIT","url":"https://github.com/jbaines-r7/badblood"},{"type":"ADVISORY","url":"https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026"},{"type":"EXPLOIT","url":"https://www.rapid7.com/blog/post/2022/01/11/cve-2021-20038-42-sonicwall-sma-100-multiple-vulnerabilities-fixed-2/"},{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20038"}],"provenance":{"sources":["OSV.dev","NVD","CISA KEV","FIRST.org (EPSS)"],"lastVerified":"2026-06-17T03:33:11.327"}}