{"id":"CVE-2020-24355","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-24355","generatedAt":"2026-10-27T23:28:22.846Z","title":"Zyxel VMG5313-B30B router on firmware 5.13(ABCJ.6)b3_1127, and possibly older versions of firmware are affected by insecure permissions which allows regular and other users to create new users with elevated privileges.","description":"Zyxel VMG5313-B30B router on firmware 5.13(ABCJ.6)b3_1127, and possibly older versions of firmware are affected by insecure permissions which allows regular and other users to create new users with elevated privileges. This is done by changing \"FirstIndex\" field in JSON that is POST-ed during account creation. Similar may also be possible with account deletion.","published":"2020-09-02T12:15:11.000Z","lastModified":"2026-06-17T03:05:25.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","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"},"cwe":["CWE-732"],"affected":["zyxel/vmg5313-b30b firmware"],"epss":{"score":0.02176,"percentile":0.82208,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (2.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.zyxel.com/support/security_advisories.shtml","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zyxel.com/support/security_advisories.shtml","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-24355","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}