{"id":"CVE-2019-9621","kind":"vulnerability","aliases":["CVE-2019-9621"],"related":[],"title":"synacor zimbra collaboration suite: Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or…","description":"Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Zimbra Collaboration Suite has a server-side request forgery flaw in its ProxyServlet component. An attacker can make the mail server send requests to internal hosts or other targets on its behalf.","severity":"high","cvss":7.5,"epss":null,"exploited":true,"exploited_at":"2025-07-07T00:00:00+00:00","products":[{"name":"Synacor Zimbra Collaboration Suite (ZCS)","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":["8.6.0"],"affected":"< 8.6.0","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":["8.7.11"],"affected":">= 8.7.0, < 8.7.11","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":["8.8.9"],"affected":">= 8.8.0, < 8.8.9","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.6.0","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.7.11","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.8.9","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.8.10","ecosystem":"vendor"},{"name":"synacor zimbra collaboration suite","fixed":[],"affected":"= 8.8.11","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["email","exploited","other","self-hosted","zimbra"],"not_affected_if":["unknown"],"how_to_check":null,"fix":"Apply the mitigations from the vendor (Synacor/Zimbra) per CISA guidance, or discontinue use of the product if mitigations are unavailable.","status":"open","published_at":"2019-04-30T18:29:08+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:46:48+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-23T20:46:48Z","model":"claude-haiku-5-5","output":{"fix":"Apply the mitigations from the vendor (Synacor/Zimbra) per CISA guidance, or discontinue use of the product if mitigations are unavailable.","reach":"internet","summary":"Zimbra Collaboration Suite has a server-side request forgery flaw in its ProxyServlet component. An attacker can make the mail server send requests to internal hosts or other targets on its behalf.","category":"other","who_cares":["zimbra","self-hosted","email"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker reaches internal services through the mail server and may read internal data.","analyst_note":"Find the vendor advisory and the affected/fixed Zimbra versions and the exact ProxyServlet mitigation; the KEV entry gives no version or check details.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000432,"input_tokens":2585,"output_tokens":347,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':138C '-2019':26A,29A '-9621':27A,30A '10':17A '13':11A '22':137C '7':24A '8.6':9A '8.7':12A '8.7.11':15A '8.8':19A '8.8.10':22A 'action':128C 'appli':129C 'applic':135C 'attack':91B 'behalf':107B 'bod':136C 'cisa':126C 'cloud':141C 'collabor':3A,6A,76B,110C 'collaboration':33A,38A,42A,46A,50A,54A,58A,62A,66A 'compon':89B,125C 'contain':113C 'cve':25A,28A 'discontinu':144C 'email':68B 'exploit':69B 'flaw':85B 'follow':134C 'forgeri':84B,119C 'guidanc':139C 'host':73B,101B 'instruct':133C 'intern':100B 'mail':95B 'make':93B 'mitig':130C,150C 'patch':10A,16A,23A 'per':131C 'product':148C 'proxyservlet':88B,124C 'request':83B,98B,118C 'requir':127C 'self':72B 'self-host':71B 'send':97B 'server':81B,96B,116C 'server-sid':80B,115C 'servic':142C 'side':82B,117C 'ssrf':120C 'suit':4A,7A,77B,111C 'suite':34A,39A,43A,47A,51A,55A,59A,63A,67A 'synacor':1A,31A,36A,40A,44A,48A,52A,56A,60A,64A,108C 'target':104B 'unavail':152C 'use':145C 'vendor':132C 'via':122C 'vulner':121C 'x':13A,20A 'zcs':35A,112C 'zimbra':2A,5A,32A,37A,41A,45A,49A,53A,57A,61A,65A,74B,75B,109C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-04-30T18:29:08+00:00","kev":{"dateAdded":"2025-07-07","dueDate":"2025-07-28","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2019-9621","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-9621","severity":null,"published_at":"2025-07-07T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T15:39:40+00:00","note":null},{"source":"nvd","external_id":"CVE-2019-9621","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-9621","severity":null,"published_at":"2019-04-30T18:29:08+00:00","modified_at":"2026-06-17T02:44:03+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+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"}