CVE-2020-24355

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.

• CWE-732

• https://blog.somegeneric.ninja/Zyxel_VMG5153_B30BExploit, Third Party Advisory
• https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2Exploit, Third Party Advisory
• https://www.zyxel.com/support/security_advisories.shtmlVendor Advisory
• https://blog.somegeneric.ninja/Zyxel_VMG5153_B30BExploit, Third Party Advisory
• https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2Exploit, Third Party Advisory
• https://www.zyxel.com/support/security_advisories.shtmlVendor Advisory

Published

Sep 2, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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