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CVE-2023-6398

HIGH

7.2

CVSS Score

Published: February 20, 2024 at 01:34 AM UTC

Updated: June 17, 2026 at 06:50 AM UTC

87 products affected across 1 vendorUSG FLEX 200 firmwareUsg Flex 100W FirmwareUSG FLEX 700 firmware

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Severity

HIGH7.2

Exploit prediction

EPSS 1%

SSVC

No known exploit

Description

A post-authentication command injection vulnerability in the file upload binary in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1, USG FLEX H series firmware versions from 1.10 through 1.10 Patch 1, NWA50AX firmware versions through 6.29(ABYW.3), WAC500 firmware versions through 6.65(ABVS.1), WAX300H firmware versions through 6.60(ACHF.1), and WBE660S firmware versions through 6.65(ACGG.1) could allow an authenticated attacker with administrator privileges to execute some operating system (OS) commands on an affected device via FTP.

Affected

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

ATP100 Firmware · Zyxel

95%

4.32 ≤ v < 5.375.37 5.37 patch1

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

ATP100W Firmware · Zyxel

95%

4.32 ≤ v < 5.375.37 5.37 patch1

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-atp100w (same device)

ATP200 Firmware · Zyxel

95%

4.32 ≤ v < 5.375.37 5.37 patch1

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-atp200 (same device)

ATP500 Firmware · Zyxel

95%

4.32 ≤ v < 5.375.37 5.37 patch1

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-atp500 (same device)

ATP700 Firmware · Zyxel

95%

4.32 ≤ v < 5.375.37 5.37 patch1

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-atp700 (same device)

ATP800 Firmware · Zyxel

95%

4.32 ≤ v ≤ 5.37_patch14.32 ≤ v < 5.374.32 5.37 5.37 patch1

Affected range stops below 5.37, so it looks safe — our inference, not a vendor statement

zyxel-atp800 (same device)

NWA110AX firmware · Zyxel

95%

v < 6.70(abtg.2)

Affected range stops below 6.70(abtg.2), so it looks safe — our inference, not a vendor statement

zyxel-nwa110ax (same device)

NWA1123ACv3 firmware · Zyxel

95%

v < 6.70(abvt.1)

Affected range stops below 6.70(abvt.1), so it looks safe — our inference, not a vendor statement

zyxel-nwa1123acv3 (same device)

NWA210AX Firmware · Zyxel

95%

v < 6.70(abtd.2)

Affected range stops below 6.70(abtd.2), so it looks safe — our inference, not a vendor statement

zyxel-nwa210ax (same device)

NWA220AX 6E Firmware · Zyxel

95%

v < 6.70(acco.1)

Affected range stops below 6.70(acco.1), so it looks safe — our inference, not a vendor statement

zyxel-nwa220ax-6e (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

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024

References (1)

Vendor Advisory

Source: [email protected]

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps-02-20-2024

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

StatusANALYZED

CWE

CWE-78

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