{"schema":"threatline.record/2","record":{"id":"CVE-2021-3156","aliases":[],"summary":"Sudo Heap-Based Buffer Overflow Vulnerability","details":"Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.","categories":["Identity & access"],"product":"Sudo","vendor":"Sudo","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-3156","source_modified_at":"2025-10-21T23:35:29.600Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"n/a","vendor":"n/a","versions":[{"version":"n/a","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":7.8,"severity":"High","kev":{"listed":true,"date_added":"2022-04-06","due_date":"2022-04-27","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.99962,"percentile":0.99976,"score_date":"2026-10-23"},"published_at":"2021-01-26T00:00:00.000Z","modified_at":"2025-10-21T23:35:29.600Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2021-3156","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:35:29.600Z"},{"source":"Metasploit","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/sudo_baron_samedit.rb","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2021-01-26"},{"source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/49521","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2021-02-03"},{"source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/49522","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2021-02-03"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-3156","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Metasploit","Exploit-DB","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3156","source":"CISA 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List","url":"https://www.kb.cert.org/vuls/id/794544","tags":["third-party-advisory","x_transferred"]},{"source":"CVE List","url":"https://www.oracle.com//security-alerts/cpujul2021.html","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.sudo.ws/stable.html#1.9.5p2","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.openwall.com/lists/oss-security/2021/01/26/3","tags":["x_transferred"]},{"source":"CVE List","url":"https://security.netapp.com/advisory/ntap-20210128-0002/","tags":["x_transferred"]},{"source":"CVE List","url":"https://security.netapp.com/advisory/ntap-20210128-0001/","tags":["x_transferred"]},{"source":"CVE List","url":"https://support.apple.com/kb/HT212177","tags":["x_transferred"]},{"source":"CVE List","url":"https://kc.mcafee.com/corporate/index?page=content&id=SB10348","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.beyondtrust.com/blog/entry/security-advisory-privilege-management-for-unix-linux-pmul-basic-and-privilege-management-for-mac-pmm-affected-by-sudo-vulnerability","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.synology.com/security/advisory/Synology_SA_21_02","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.oracle.com/security-alerts/cpuoct2021.html","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.oracle.com/security-alerts/cpuapr2022.html","tags":["x_transferred"]},{"source":"CVE List","url":"https://www.vicarius.io/vsociety/posts/sudoedit-pwned-cve-2021-3156"},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3156","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2025-02-03T15:43:52.658146Z"},"exploits":[{"source":"Metasploit","kind":"Exploit module","name":"Sudo Heap-Based Buffer Overflow","url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/sudo_baron_samedit.rb","date":"2021-01-26","added":"2023-02-08","check":true},{"source":"Exploit-DB","kind":"Local exploit","name":"Sudo 1.9.5p1 - 'Baron Samedit ' Heap-Based Buffer Overflow Privilege Escalation (1)","url":"https://www.exploit-db.com/exploits/49521","date":"2021-02-03","added":"2021-02-03","verified":false},{"source":"Exploit-DB","kind":"Local exploit","name":"Sudo 1.9.5p1 - 'Baron Samedit ' Heap-Based Buffer Overflow Privilege Escalation (2)","url":"https://www.exploit-db.com/exploits/49522","date":"2021-02-03","added":"2021-02-03","verified":false}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:35:29.600Z","content_hash":"13410ec32df654fc33b592934b754f92eb65b6ada1a64c47e2efe8a52598bc4c"}}