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CVE-2022-38547

HIGH
7.2
CVSS Score
Published: February 7, 2023 at 12:00 AM UTC
Updated: June 17, 2026 at 04:56 AM UTC
55 products affected across 1 vendorUsg Flex 100W FirmwareUSG FLEX 200 firmwareUSG FLEX 700 firmware

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Severity
HIGH7.2
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

A post-authentication command injection vulnerability in the CLI command of Zyxel ZyWALL/USG series firmware versions 4.20 through 4.72, VPN series firmware versions 4.30 through 5.32, USG FLEX series firmware versions 4.50 through 5.32, and ATP series firmware versions 4.32 through 5.32, which could allow an authenticated attacker with administrator privileges to execute OS commands.

Affected

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

ATP100 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.32
ATP100W Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.32
zyxel-atp100w (same device)
ATP200 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.32
zyxel-atp200 (same device)
ATP500 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.32
zyxel-atp500 (same device)
ATP700 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.32
zyxel-atp700 (same device)
ATP800 Firmware· Zyxel
95%
4.32 ≤ v ≤ 5.32
zyxel-atp800 (same device)
Usg 20W VPN Firmware· Zyxel
95%
4.30 ≤ v ≤ 5.32
Usg Flex 100 Firmware· Zyxel
95%
4.50 ≤ v ≤ 5.32
zyxel-usg-flex-100 (same device)
Usg Flex 100W Firmware· Zyxel
95%
4.50 ≤ v ≤ 5.32
zyxel-usg-flex-100w (same device)
USG FLEX 200 firmware· Zyxel
95%
4.50 ≤ v ≤ 5.32
zyxel-usg-flex-200 (same device)

Remediation

No guide yet

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

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-post-authentication-rce-in-firewalls

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGHZyxel
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-78

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