{"schemaVersion":3,"id":"CVE-2025-7673","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions prior to V5.50(ABOM.5)C0 could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and potentially execute arbitrary code by sending a specially crafted HTTP request.","dates":{"published":"2025-07-16T07:11:02.974Z","modified":"2026-02-26T17:50:32.365Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00652,"percentile":0.5036,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.10699999999999998,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00545},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00652,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00652,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00652,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00652,"percentile":0.5036}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00545,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00593,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00652,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00652,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00652,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00652,"percentile":0.5036}]},"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-120","name":"Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","description":"The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/120.html"}],"affected":[{"vendor":"zyxel","product":"emg3525-t50b_firmware","name":"emg3525-t50b firmware","label":"emg3525-t50b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abpm.4\\)c0","noFixRecorded":false,"fixedIn":null},{"text":"< 5.50\\(absl.0\\)b8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abpm.4\\)c0 | < 5.50\\(absl.0\\)b8","eol":null,"hubHref":"/vendor/zyxel/emg3525-t50b"},{"vendor":"zyxel","product":"emg5523-t50b_firmware","name":"emg5523-t50b firmware","label":"emg5523-t50b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abpm.4\\)c0","noFixRecorded":false,"fixedIn":null},{"text":"< 5.50\\(absl.0\\)b8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abpm.4\\)c0 | < 5.50\\(absl.0\\)b8","eol":null,"hubHref":"/vendor/zyxel/emg5523-t50b"},{"vendor":"zyxel","product":"emg5723-t50k_firmware","name":"emg5723-t50k firmware","label":"emg5723-t50k_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abom.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abom.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/emg5723-t50k"},{"vendor":"zyxel","product":"emg6726-b10a_firmware","name":"emg6726-b10a firmware","label":"emg6726-b10a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(abnp.6\\).c","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(abnp.6\\).c","eol":null,"hubHref":"/vendor/zyxel/emg6726-b10a"},{"vendor":"zyxel","product":"ex3510-b0_firmware","name":"ex3510-b0 firmware","label":"ex3510-b0_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.17\\(abup.3\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.17\\(abup.3\\)c0","eol":null,"hubHref":"/vendor/zyxel/ex3510-b0"},{"vendor":"zyxel","product":"ex5510-b0_firmware","name":"ex5510-b0 firmware","label":"ex5510-b0_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.15\\(abqx.3\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.15\\(abqx.3\\)c0","eol":null,"hubHref":"/vendor/zyxel/ex5510-b0"},{"vendor":"zyxel","product":"vmg1312-t20b_firmware","name":"vmg1312-t20b firmware","label":"vmg1312-t20b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(absb.3\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(absb.3\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg1312-t20b"},{"vendor":"zyxel","product":"vmg3625-t50b_firmware","name":"vmg3625-t50b firmware","label":"vmg3625-t50b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abpm.4\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abpm.4\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg3625-t50b"},{"vendor":"zyxel","product":"vmg3925-b10b_firmware","name":"vmg3925-b10b firmware","label":"vmg3925-b10b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(aavf.16\\)c","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(aavf.16\\)c","eol":null,"hubHref":"/vendor/zyxel/vmg3925-b10b"},{"vendor":"zyxel","product":"vmg3925-b10c_firmware","name":"vmg3925-b10c firmware","label":"vmg3925-b10c_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(aavf.16\\)c","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(aavf.16\\)c","eol":null,"hubHref":"/vendor/zyxel/vmg3925-b10c"},{"vendor":"zyxel","product":"vmg3927-b50a_firmware","name":"vmg3927-b50a firmware","label":"vmg3927-b50a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.15\\(abmt.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.15\\(abmt.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg3927-b50a"},{"vendor":"zyxel","product":"vmg3927-b50b_firmware","name":"vmg3927-b50b firmware","label":"vmg3927-b50b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(ably.6\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(ably.6\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg3927-b50b"},{"vendor":"zyxel","product":"vmg3927-b60a_firmware","name":"vmg3927-b60a firmware","label":"vmg3927-b60a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.15\\(abmt.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.15\\(abmt.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg3927-b60a"},{"vendor":"zyxel","product":"vmg3927-t50k_firmware","name":"vmg3927-t50k firmware","label":"vmg3927-t50k_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abom.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abom.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg3927-t50k"},{"vendor":"zyxel","product":"vmg4005-b50b_firmware","name":"vmg4005-b50b firmware","label":"vmg4005-b50b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(abrl.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(abrl.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg4005-b50b"},{"vendor":"zyxel","product":"vmg4927-b50a_firmware","name":"vmg4927-b50a firmware","label":"vmg4927-b50a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(ably.6\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(ably.6\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg4927-b50a"},{"vendor":"zyxel","product":"vmg8623-t50b_firmware","name":"vmg8623-t50b firmware","label":"vmg8623-t50b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abpm.4\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abpm.4\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg8623-t50b"},{"vendor":"zyxel","product":"vmg8825-b50a_firmware","name":"vmg8825-b50a firmware","label":"vmg8825-b50a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.15\\(abmt.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.15\\(abmt.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg8825-b50a"},{"vendor":"zyxel","product":"vmg8825-b60a_firmware","name":"vmg8825-b60a firmware","label":"vmg8825-b60a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.15\\(abmt.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.15\\(abmt.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg8825-b60a"},{"vendor":"zyxel","product":"vmg8825-bx0b_firmware","name":"vmg8825-bx0b firmware","label":"vmg8825-bx0b_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.17\\(abny.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.17\\(abny.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg8825-bx0b"},{"vendor":"zyxel","product":"vmg8825-t50k_firmware","name":"vmg8825-t50k firmware","label":"vmg8825-t50k_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.50\\(abom.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.50\\(abom.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg8825-t50k"},{"vendor":"zyxel","product":"vmg8825-t50k firmware","name":"VMG8825-T50K firmware","label":"vmg8825-t50k firmware","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< V5.50(ABOM.5)C0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< V5.50(ABOM.5)C0","eol":null,"hubHref":"/vendor/zyxel/vmg8825-t50k_firmware"},{"vendor":"zyxel","product":"vmg8924-b10d_firmware","name":"vmg8924-b10d firmware","label":"vmg8924-b10d_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.13\\(abgq.6\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.13\\(abgq.6\\)c0","eol":null,"hubHref":"/vendor/zyxel/vmg8924-b10d"},{"vendor":"zyxel","product":"xmg3927-b50a_firmware","name":"xmg3927-b50a firmware","label":"xmg3927-b50a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.15\\(abmt.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.15\\(abmt.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/xmg3927-b50a"},{"vendor":"zyxel","product":"xmg8825-b50a_firmware","name":"xmg8825-b50a firmware","label":"xmg8825-b50a_firmware","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"< 5.17\\(abmt.5\\)c0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 5.17\\(abmt.5\\)c0","eol":null,"hubHref":"/vendor/zyxel/xmg8825-b50a"}],"affectedCount":25,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe","label":"www.zyxel.com/service-provider/…","hostname":"www.zyxel.com","tags":["Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2025-07-16T07:11:02.974Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-02-26T17:50:32.365Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T12:07:46.250Z","stale":false,"partial":false}}