{"cve":"CVE-2020-24355","nvd":{"published":"2020-09-02T12:15:10.550","modified":"2026-06-17T03:05:25.400","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-732"],"references":["https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B","https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2","https://www.zyxel.com/support/security_advisories.shtml","https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B","https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2"],"products":["zyxel:vmg5313-b30b_firmware"],"source":"nvd","synced_at":"2026-10-19T21:09:20.498348299+00:00"},"epss":{"cve":"CVE-2020-24355","score":0.02176,"percentile":0.82333,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}