{"id":"CVE-2025-7673","published":"2025-07-16T07:11:02Z","modified":"2026-02-26T17:50:32Z","title":"A buffer overflow vulnerability in the URL parser of the zhttpd web server in Zyxel VMG8825-T50K firmware versions…","vendor":"Zyxel","product":"VMG8825-T50K firmware","tier":"core","eol":null,"affectedVersions":[{"vendor":"Zyxel","product":"VMG8825-T50K firmware","versions":["< V5.50(ABOM.5)C0"]}],"description":{"text":"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.","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00652,"percentile":0.5117,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2025-07-16","exploitedFirstSeen":"2025-07-16","ransomware":false,"evidence":[{"url":"https://www.vulncheck.com/advisories/zyxel-cpe-zhttpd-webserver-rce","date":"2025-07-16"}],"evidenceTotal":1,"provenance":"source"},"exploited":true,"otx":{"pulseCount":0,"pulses":[],"provenance":"machine"},"cwes":[{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"references":[{"url":"https://www.zyxel.com/service-provider/global/en/zyxel-security-advisory-remote-code-execution-and-denial-service-vulnerabilities-cpe","tags":["vendor-advisory"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-21579","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-21579","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2025-07-16","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2025-7673","provenance":"source"},{"date":"2025-07-16","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.vulncheck.com/advisories/zyxel-cpe-zhttpd-webserver-rce","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":52.1,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 471 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":10.23,"detail":"percentile 0.5117"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}