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CVE-2020-24355

CRITICAL
9.8
CVSS Score
Published: September 2, 2020 at 11:15 AM UTC
Updated: June 17, 2026 at 03:05 AM UTC
2 products affected across 1 vendorVmg5313-b30b FirmwareVmg5313-B30B

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vmg5313-b30b Firmware· Zyxel
95%
v ≤ 5.13(abcj.6)b3_1127
zyxel-vmg5313-b30b (same device)
Vmg5313-B30B· Zyxeldevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.zyxel.com/support/security_advisories.shtml

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-732

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