CVE-2023-4228Network attack vector

Session hijacking via missing HttpOnly flag

Published Aug 24, 2023 · Updated Oct 1, 2024

Sensitive cookie exposure in Moxa ioLogik 4000 Series firmware 1.6 and earlier allows remote attackers to access session data via the web service. The web server sets session cookies without the HttpOnly attribute, allowing script-capable content reaching the interface to read them and potentially compromise authenticated sessions. Exploitation requires network access to the device web interface; the documented impact is confidentiality of session data and possible session manipulation, with no evidence of direct availability loss.

CVSS severity4.3
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive cookie exposure in Moxa ioLogik 4000 Series firmware 1.6 and earlier allows remote attackers to access session data via the web service. The web server sets session cookies without the HttpOnly attribute, allowing script-capable content reaching the interface to read them and potentially compromise authenticated sessions. Exploitation requires network access to the device web interface; the documented impact is confidentiality of session data and possible session manipulation, with no evidence of direct availability loss.

The record

CVE
CVE-2023-4228
Published
Aug 24, 2023
Updated
Oct 1, 2024
Vendor
Moxa
Product
ioLogik 4000 Series
Classifications
CWE-1004, CWE-732, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2024Record 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=1.0 <=1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moxa · ioLogik 4000 Seriesversion=1.0 <=1.6

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
3.1Moxa Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1004Sensitive Cookie Without 'HttpOnly' Flag
CWE-732Incorrect Permission Assignment for Critical Resource
T1539Steal Web Session Cookie

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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