{"schemaVersion":3,"id":"CVE-2018-8929","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Improper restriction of communication channel to intended endpoints vulnerability in HTTP daemon in Synology SSL VPN Client before 1.2.4-0224 allows remote attackers to conduct man-in-the-middle attacks via a crafted payload.","dates":{"published":"2018-07-06T12:00:00.000Z","modified":"2024-09-16T20:41:43.731Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.0","versionLabel":"v3.0","source":"NVD","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":7.3,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":6.8,"severity":"medium","vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00753,"percentile":0.54239,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00753},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00839,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00753,"percentile":0.54239}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00839,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00753,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00753,"percentile":0.54239}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-319","name":"Cleartext Transmission of Sensitive Information","description":"The product transmits sensitive or security-critical data in cleartext in a communication channel that can be sniffed by unauthorized actors.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/319.html"},{"id":"CWE-417","name":"Communication Channel Errors","description":"Weaknesses in this category are related to improper handling of communication channels and access paths. These weaknesses include problems in creating, managing, or removing alternate channels and alternate paths. Some of these can overlap virtual file problems and are commonly used in \"bypass\" attacks, such as those that exploit authentication errors.","type":"category","status":"Draft","abstraction":null,"likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/417.html"}],"affected":[{"vendor":"synology","product":"ssl_vpn_client","name":"ssl vpn client","label":"ssl_vpn_client","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 1.2.4-0224","noFixRecorded":false,"fixedIn":null},{"text":"< 1.2.4-0224","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 1.2.4-0224 | < 1.2.4-0224","eol":null,"hubHref":"/vendor/synology/ssl_vpn_client"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.synology.com/en-global/support/security/Synology_SA_18_19","label":"www.synology.com/en-global/support/security/Synology_SA_18_19","hostname":"www.synology.com","tags":["X Refsource CONFIRM","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2018-07-06T12:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-09-16T20:41:43.731Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":33,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T00:08:27.929Z","stale":false,"partial":false}}