{"id":"CVE-2025-0890","published":"2025-02-04T10:06:56Z","modified":"2025-02-12T20:51:26Z","title":"**UNSUPPORTED WHEN ASSIGNED** Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel…","vendor":"Zyxel","product":"VMG4325-B10A firmware","tier":"core","eol":null,"affectedVersions":[{"vendor":"Zyxel","product":"VMG4325-B10A firmware","versions":["<= 1.00(AAFR.4)C0_20170615"]}],"description":{"text":"**UNSUPPORTED WHEN ASSIGNED**\nInsecure default credentials for the Telnet function in the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an attacker to log in to the management interface if the administrators have the option to change the default credentials but fail to do so.","provenance":"source","from":"CVE.org"},"summary":{"text":"The Zyxel VMG4325-B10A firmware (version 1.00(AAFR.4)C0_20170615, a legacy DSL customer-premises router) ships with insecure default credentials for its Telnet management function. An attacker with network access to the device can log in to the management interface without authenticating as a legitimate user, provided the administrator has not changed the default credentials.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T08:32:14Z"},"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":0.14379,"percentile":0.96614,"date":"2026-10-30","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2026-01-20","exploitedFirstSeen":"2026-01-20","ransomware":false,"evidence":[{"url":"https://www.loginsoft.com/reports/annually/vulnerability-intelligence-report-2025","date":"2026-01-20"}],"evidenceTotal":1,"provenance":"source"},"exploited":true,"otx":{"pulseCount":0,"pulses":[],"provenance":"machine"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"}],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025","tags":["vendor-advisory"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-1913","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-1913","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":1,"earliest":"2026-08-13","earliestUrl":"https://github.com/Danyw24/zyxel-p870hn-hardware-hacking","repos":[{"name":"Danyw24/zyxel-p870hn-hardware-hacking","url":"https://github.com/Danyw24/zyxel-p870hn-hardware-hacking","stars":0,"created":"2026-08-13"}]},"first":{"date":"2026-08-13","source":"PoC-in-GitHub","url":"https://github.com/Danyw24/zyxel-p870hn-hardware-hacking"},"provenance":"source"},"exploitRefs":[],"flow":[],"timeline":[{"date":"2025-02-04","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2025-0890","provenance":"source"},{"date":"2026-01-20","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.loginsoft.com/reports/annually/vulnerability-intelligence-report-2025","provenance":"source"},{"date":"2026-08-13","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/Danyw24/zyxel-p870hn-hardware-hacking","provenance":"source"}],"speed":{"daysToPublicExploit":555,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":71.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 284 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.32,"detail":"percentile 0.9661"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 PoC-in-GitHub repo"},{"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"}]}}