{"id":"CVE-2019-10149","kind":"vulnerability","aliases":["CVE-2019-10149"],"related":[],"title":"Exim Mail Transfer Agent (MTA): Exim Mail Transfer Agent (MTA) Improper Input Validation","description":"Improper validation of recipient address in deliver_message() function in /src/deliver.c may lead to remote command execution.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Exim, a mail transfer agent that runs on many mail servers, does not properly validate recipient addresses in its delivery code. A remote attacker can send a crafted address to run commands on the server.","severity":"critical","cvss":10.0,"epss":0.99961,"exploited":true,"exploited_at":"2022-01-10T00:00:00+00:00","products":[{"name":"Exim Mail Transfer Agent (MTA)","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exim","exploited","mail-server","runtime","self-hosted"],"not_affected_if":["managed-hosting","no-exim-installed"],"how_to_check":null,"fix":"Apply the Exim update that addresses CVE-2019-10149 per vendor instructions (CISA KEV required action); the fixed version is not stated in the sources.","status":"open","published_at":"2019-06-05T14:29:11+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:31:44+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-23T21:31:44Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Exim update that addresses CVE-2019-10149 per vendor instructions (CISA KEV required action); the fixed version is not stated in the sources.","reach":"internet","impact":"high","summary":"Exim, a mail transfer agent that runs on many mail servers, does not properly validate recipient addresses in its delivery code. A remote attacker can send a crafted address to run commands on the server.","category":"runtime","who_cares":["exim","self-hosted","mail-server"],"confidence":0.7,"needs_auth":"no","worst_case":"Remote attacker runs commands as the mail server user","analyst_note":"Find the fixed Exim version and the exact exposure condition (default config or special setup) from the NVD or Exim advisory; check the CISA KEV entry for the due date.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["managed-hosting","no-exim-installed"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000462,"input_tokens":2838,"output_tokens":356,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the fixed Exim version and the exact exposure condition (default config or special setup) from the NVD or Exim advisory; check the CISA KEV entry for the due date.","search":"'-10149':16A,19A '-2019':15A,18A '/src/deliver.c':79C 'action':88C 'address':50B,62B,73C 'agent':4A,9A,23A,38B 'appli':89C 'attack':57B 'cisa':86C 'code':54B 'command':65B,84C 'craft':61B 'cve':14A,17A 'deliv':75C 'deliveri':53B 'execut':85C 'exim':1A,6A,20A,25B,34B 'exploit':26B 'function':77C 'host':33B 'improp':11A,69C 'input':12A 'instruct':93C 'lead':81C 'mail':2A,7A,21A,28B,36B,43B 'mail-serv':27B 'mani':42B 'may':80C 'messag':76C 'mta':5A,10A,24A 'per':91C 'proper':47B 'recipi':49B,72C 'remot':56B,83C 'requir':87C 'run':40B,64B 'runtim':30B 'self':32B 'self-host':31B 'send':59B 'server':29B,44B,68B 'transfer':3A,8A,22A,37B 'updat':90C 'valid':13A,48B,70C 'vendor':92C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-06-05T14:29:11+00:00","kev":{"dateAdded":"2022-01-10","dueDate":"2022-07-10","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2019-10149","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-10149","severity":null,"published_at":"2022-01-10T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T13:39:32+00:00","note":null},{"source":"epss","external_id":"CVE-2019-10149","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-10149","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2019-10149","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-10149","severity":null,"published_at":"2019-06-05T14:29:11+00:00","modified_at":"2026-06-17T02:10:21+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}