© 2026 vulntracker.io

CVE-2023-22918

MEDIUM

6.5

CVSS Score

Published: April 24, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:36 AM UTC

106 products affected across 1 vendorUsg Flex 100W FirmwareUSG FLEX 200 firmwareUSG FLEX 700 firmware

Using ATP series firmware by Zyxel?

Get instant alerts when new vulnerabilities affect ATP series firmware - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM6.5

Exploit prediction

EPSS 0.8%

SSVC

No known exploit

Description

A post-authentication information exposure vulnerability in the CGI program of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, VPN series firmware versions 4.30 through 5.35, NWA110AX firmware version 6.50(ABTG.2) and earlier versions, WAC500 firmware version 6.50(ABVS.0) and earlier versions, and WAX510D firmware version 6.50(ABTF.2) and earlier versions, which could allow a remote authenticated attacker to retrieve encrypted information of the administrator on an affected device.

Affected

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

ATP100 Firmware · Zyxel

95%

4.32 ≤ v < 5.36

Affected range stops below 5.36, so it looks safe — our inference, not a vendor statement

ATP100W Firmware · Zyxel

95%

4.32 ≤ v < 5.36

Affected range stops below 5.36, so it looks safe — our inference, not a vendor statement

zyxel-atp100w (same device)

ATP200 Firmware · Zyxel

95%

4.32 ≤ v < 5.36

Affected range stops below 5.36, so it looks safe — our inference, not a vendor statement

zyxel-atp200 (same device)

ATP500 Firmware · Zyxel

95%

4.32 ≤ v < 5.36

Affected range stops below 5.36, so it looks safe — our inference, not a vendor statement

zyxel-atp500 (same device)

ATP700 Firmware · Zyxel

95%

4.32 ≤ v < 5.36

Affected range stops below 5.36, so it looks safe — our inference, not a vendor statement

zyxel-atp700 (same device)

ATP800 Firmware · Zyxel

95%

4.32 ≤ v < 5.36

Affected range stops below 5.36, so it looks safe — our inference, not a vendor statement

zyxel-atp800 (same device)

NAP203 firmware · Zyxel

95%

v ≤ 6.28(abfa.0)

zyxel-nap203 (same device)

NAP303 Firmware · Zyxel

95%

v ≤ 6.28(abex.0)

zyxel-nap303 (same device)

NAP353 Firmware · Zyxel

95%

v ≤ 6.28(abey.0)

zyxel-nap353 (same device)

NWA110AX firmware · Zyxel

95%

v ≤ 6.50v ≤ 6.50(abtg.2)

zyxel-nwa110ax (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-of-firewalls-and-aps

References (1)

PatchVendor Advisory

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

6.5MEDIUMZyxel

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-359NVD-CWE-noinfo

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card