{"cveID":"CVE-2018-6789","vendorProject":"Exim","product":"Exim","vulnerabilityName":"Exim Buffer Overflow Vulnerability","dateAdded":"2021-11-03","shortDescription":"Exim contains a buffer overflow vulnerability in the base64d function part of the SMTP listener that may allow for remote code execution.","requiredAction":"Apply updates per vendor instructions.","dueDate":"2022-05-03","knownRansomwareCampaignUse":"Known","notes":"https://nvd.nist.gov/vuln/detail/CVE-2018-6789","cwes":["CWE-119"],"year":2018,"state":"mapped","stale_reasons":[],"mappings":[{"domain":"enterprise","cve":"CVE-2018-6789","technique":"T1190","technique_name_at_mapping":"Exploit Public-Facing Application","mapping_type":"exploitation_technique","capability_group":"buffer_overflow","comments":"CVE-2018-6789 is a vulnerability in Exim, an open-source mail transfer agent. This vulnerability, identified as an off-by-one buffer overflow, allows attackers to execute arbitrary code remotely by sending specially crafted messages to the SMTP listener. ","references":["https://www.bleepingcomputer.com/news/security/nsa-top-25-vulnerabilities-actively-abused-by-chinese-hackers/","https://news.sophos.com/en-us/2019/06/07/action-required-exim-mail-servers-need-urgent-patching/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"},{"domain":"enterprise","cve":"CVE-2018-6789","technique":"T1059","technique_name_at_mapping":"Command and Scripting Interpreter","mapping_type":"primary_impact","capability_group":"buffer_overflow","comments":"CVE-2018-6789 is a vulnerability in Exim, an open-source mail transfer agent. This vulnerability, identified as an off-by-one buffer overflow, allows attackers to execute arbitrary code remotely by sending specially crafted messages to the SMTP listener. ","references":["https://www.bleepingcomputer.com/news/security/nsa-top-25-vulnerabilities-actively-abused-by-chinese-hackers/","https://news.sophos.com/en-us/2019/06/07/action-required-exim-mail-servers-need-urgent-patching/"],"status":"complete","source_file":"kev-07.28.2025_attack-16.1-enterprise.json","attack_version":"16.1","kev_snapshot":"07/28/2025"}],"techniques":[{"id":"T1059","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Command and Scripting Interpreter","name_at_mapping":"Command and Scripting Interpreter","renamed":false,"revoked_by":null,"mapping_types":["primary_impact"],"sigma_rule_count":95,"has_detection_strategy":true},{"id":"T1190","domains":["enterprise"],"in_current_bundle":true,"live":true,"name_now":"Exploit Public-Facing Application","name_at_mapping":"Exploit Public-Facing Application","renamed":false,"revoked_by":null,"mapping_types":["exploitation_technique"],"sigma_rule_count":149,"has_detection_strategy":true}],"mapping_types":["exploitation_technique","primary_impact"],"has_exploitation_technique":true,"mapping_attack_versions":["16.1"],"mapping_domains":["enterprise"],"sigma_coverage":"full","sigma_rules_tagged_cve":[],"added_after_mapping_snapshot":false,"_source":"kevmap","_built":"2026-08-24 19:45 UTC","_attack_version":"19.2"}