{"id":"CVE-2019-9670","kind":"vulnerability","aliases":["CVE-2019-9670"],"related":[],"title":"Synacor Zimbra Collaboration Suite (ZCS): Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference","description":"Synacor Zimbra Collaboration Suite (ZCS) contains an improper restriction of XML external entity (XXE) vulnerability in the mailboxd component.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Zimbra Collaboration Suite has an XML external entity (XXE) flaw in its mailboxd component, which is the core mail server process. An attacker can send crafted XML to make the server read local files or reach internal network resources.","severity":"critical","cvss":9.8,"epss":0.99986,"exploited":true,"exploited_at":"2022-01-10T00:00:00+00:00","products":[{"name":"Synacor Zimbra Collaboration Suite (ZCS)","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","mail-server","package","self-hosted","zimbra"],"not_affected_if":["managed-hosting"],"how_to_check":null,"fix":"Apply the Zimbra updates that address CVE-2019-9670 per vendor instructions, as directed by CISA.","status":"open","published_at":"2019-05-29T22:29:01+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:31:40+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-23T21:31:40Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Zimbra updates that address CVE-2019-9670 per vendor instructions, as directed by CISA.","reach":"network","impact":"high","summary":"Zimbra Collaboration Suite has an XML external entity (XXE) flaw in its mailboxd component, which is the core mail server process. An attacker can send crafted XML to make the server read local files or reach internal network resources.","category":"package","who_cares":["zimbra","self-hosted","mail-server"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Server reads local files and internal resources through crafted XML requests","analyst_note":"Find the fixed Zimbra versions and the vendor advisory for CVE-2019-9670 (CISA KEV entry lists the required action; check Zimbra's security center) to fill fix and how_to_check.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["managed-hosting"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000469,"input_tokens":2881,"output_tokens":362,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the fixed Zimbra versions and the vendor advisory for CVE-2019-9670 (CISA KEV entry lists the required action; check Zimbra's security center) to fill fix and how_to_check.","search":"'-2019':19A,22A '-9670':20A,23A 'action':98C 'appli':99C 'attack':60B 'cisa':96C 'collabor':3A,8A,39B,79C 'collaboration':26A 'compon':51B,95C 'contain':82C 'core':55B 'craft':63B 'cve':18A,21A 'entiti':16A,45B,89C 'exploit':29B 'extern':15A,44B,88C 'file':71B 'flaw':47B 'host':36B 'improp':11A,84C 'instruct':103C 'intern':74B 'local':70B 'mail':31B,56B 'mail-serv':30B 'mailboxd':50B,94C 'make':66B 'network':75B 'packag':33B 'per':101C 'process':58B 'reach':73B 'read':69B 'refer':17A 'requir':97C 'resourc':76B 'restrict':12A,85C 'self':35B 'self-host':34B 'send':62B 'server':32B,57B,68B 'suit':4A,9A,40B,80C 'suite':27A 'synacor':1A,6A,24A,77C 'updat':100C 'vendor':102C 'vulner':91C 'xml':14A,43B,64B,87C 'xxe':46B,90C 'zcs':5A,10A,28A,81C 'zimbra':2A,7A,25A,37B,38B,78C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-05-29T22:29:01+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-2019-9670","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-9670","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":"2026-10-25T11:39:17+00:00","note":null},{"source":"epss","external_id":"CVE-2019-9670","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-9670","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-2019-9670","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-9670","severity":null,"published_at":"2019-05-29T22:29:01+00:00","modified_at":"2026-06-17T02:44:09+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"}