CVE-2023-22918Network attack vector

Authenticated disclosure of encrypted administrator information

Published Apr 24, 2023 · Updated Feb 12, 2025

Information exposure in Zyxel firewall and AP firmware allows remote authenticated users to retrieve encrypted administrator information. Zyxel identifies only the CGI program and has not published the request handler or operation that exposes the encrypted data. Exploitation requires an authenticated management session; WAN access is disabled by default, and the reported impact is limited to disclosure.

CVSS severity6.5
Medium
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Zyxel firewall and AP firmware allows remote authenticated users to retrieve encrypted administrator information. Zyxel identifies only the CGI program and has not published the request handler or operation that exposes the encrypted data. Exploitation requires an authenticated management session; WAN access is disabled by default, and the reported impact is limited to disclosure.

The record

CVE
CVE-2023-22918
Published
Apr 24, 2023
Updated
Feb 12, 2025
Vendor
Zyxel Networks
Product
WAC500 Firmware
Classifications
CWE-359
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 6.50(ABVS.0)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zyxel Networks · WAC500 Firmwareversion=<= 6.50(ABVS.0)
Zyxel Networks · WAX510D Firmwareversion=<= 6.50(ABTF.2)
Zyxel Networks · Zyxel ATP Series Firmwareversion=4.32 through 5.35
Zyxel Networks · Zyxel USG FLEX 50(W) Firmwareversion=4.16 through 5.35
Zyxel Networks · NWA110AX Firmwareversion=<= 6.50(ABTG.2)
Zyxel Networks · Zyxel VPN Series Firmwareversion=4.30 through 5.35
Zyxel Networks · Zyxel USG FLEX Series Firmwareversion=4.50 through 5.35

Published CVSS scores

6.5Zyxel CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-359Exposure of Private Personal Information to an Unauthorized Actor

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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