CVE-2023-6398

Name: CVE-2023-6398
Creator: NVD / NIST
Published: 2024-02-20T02:15:49.11+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.33%

Last modified Jun 17, 2026

CVE-2023-6398 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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.. EPSS estimates a 1.33% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.33%

67.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Zyxel	Atp100 Firmware	>= 4.32, < 5.37
Zyxel	Atp100 Firmware	5.37
Zyxel	Atp100w Firmware	>= 4.32, < 5.37
Zyxel	Atp100w Firmware	5.37
Zyxel	Atp200 Firmware	>= 4.32, < 5.37
Zyxel	Atp200 Firmware	5.37
Zyxel	Atp500 Firmware	>= 4.32, < 5.37
Zyxel	Atp500 Firmware	5.37
Zyxel	Atp700 Firmware	>= 4.32, < 5.37
Zyxel	Atp700 Firmware	5.37
Zyxel	Atp800 Firmware	>= 4.32, < 5.37
Zyxel	Atp800 Firmware	5.37
Zyxel	Usg Flex 100 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 100 Firmware	5.37
Zyxel	Usg Flex 100ax Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 100ax Firmware	5.37
Zyxel	Usg Flex 100h Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 100h Firmware	5.37
Zyxel	Usg Flex 100w Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 100w Firmware	5.37
Zyxel	Usg Flex 200 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 200 Firmware	5.37
Zyxel	Usg Flex 200h Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 200h Firmware	5.37
Zyxel	Usg Flex 200hp Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 200hp Firmware	5.37
Zyxel	Usg Flex 50 Firmware	>= 4.16, < 5.37
Zyxel	Usg Flex 50 Firmware	5.37
Zyxel	Usg Flex 500 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 500 Firmware	5.37
Zyxel	Usg Flex 500h Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 500h Firmware	5.37
Zyxel	Usg Flex 50w Firmware	>= 4.16, < 5.37
Zyxel	Usg Flex 50w Firmware	5.37
Zyxel	Usg Flex 700 Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 700 Firmware	5.37
Zyxel	Usg Flex 700h Firmware	>= 4.50, < 5.37
Zyxel	Usg Flex 700h Firmware	5.37
Zyxel	Usg20-Vpn Firmware	>= 4.16, < 5.37
Zyxel	Usg20-Vpn Firmware	5.37
Zyxel	Usg20w-Vpn Firmware	>= 4.16, < 5.37
Zyxel	Usg20w-Vpn Firmware	5.37
Zyxel	Uos	1.10
Zyxel	Nwa50ax Firmware	< 6.29\(abyw.4\)
Zyxel	Nwa55axe Firmware	< 6.29\(abzl.4\)
Zyxel	Nwa90ax Firmware	< 6.29\(accv.4\)
Zyxel	Nwa110ax Firmware	< 6.70\(abtg.2\)
Zyxel	Nwa210ax Firmware	< 6.70\(abtd.2\)
Zyxel	Nwa220ax-6e Firmware	< 6.70\(acco.1\)
Zyxel	Nwa1123acv3 Firmware	< 6.70\(abvt.1\)

Showing 50 of 63 affected configurations. See NVD for the full list.

References

Timeline

Published: Feb 20, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-6398?

How severe is CVE-2023-6398?

CVE-2023-6398 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.33% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6398?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-6398?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST