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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
mitreCNA
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 57%
VendorProductVersion
zyxelvmg5313-b30b_firmware
𝑥
≤ 5.13\(abcj.6\)b3_1127
𝑥
= Vulnerable software versions
Common Weakness Enumeration
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
https://www.zyxel.com/support/security_advisories.shtml