CVE-2023-4217Network attack vector

Session-data disclosure via missing HttpOnly attribute

Published Nov 2, 2023 · Updated Sep 5, 2024

Sensitive-cookie handling in Moxa PT-G503 Series firmware 5.2 and earlier allows remote attackers to access user session data. The web service issues session cookies without the HttpOnly attribute, allowing browser-side scripts to read the cookie value. Exploitation requires user interaction and a reachable web interface, and the reported consequence is unauthorized session-data access rather than modification or service interruption.

CVSS severity3.1
Low
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-cookie handling in Moxa PT-G503 Series firmware 5.2 and earlier allows remote attackers to access user session data. The web service issues session cookies without the HttpOnly attribute, allowing browser-side scripts to read the cookie value. Exploitation requires user interaction and a reachable web interface, and the reported consequence is unauthorized session-data access rather than modification or service interruption.

The record

CVE
CVE-2023-4217
Published
Nov 2, 2023
Updated
Sep 5, 2024
Vendor
Moxa
Product
PT-G503 Series
Classifications
CWE-668, CWE-1004, CAPEC-107, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 5, 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 <=5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moxa · PT-G503 Seriesversion=1.0 <=5.2

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
3.1MoxaCVSS: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-668Exposure of Resource to Wrong Sphere
CWE-1004Sensitive Cookie Without 'HttpOnly' Flag
CAPEC-107Cross Site Tracing
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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