CVE-2023-5035Network attack vector

Session cookie disclosure via missing Secure attribute

Published Nov 2, 2023 · Updated Sep 5, 2024

CWE-614 in the web service of Moxa PT-G503 Series firmware 1.0 through 5.2 allows remote attackers to expose session cookies over HTTP. The HTTPS web service issues sensitive session cookies without the Secure attribute, permitting browsers to retransmit them over unencrypted HTTP. Exploitation requires user interaction and an HTTP connection; the reported impact is limited to disclosure of session-cookie data.

CVSS severity3.1
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CWE-614 in the web service of Moxa PT-G503 Series firmware 1.0 through 5.2 allows remote attackers to expose session cookies over HTTP. The HTTPS web service issues sensitive session cookies without the Secure attribute, permitting browsers to retransmit them over unencrypted HTTP. Exploitation requires user interaction and an HTTP connection; the reported impact is limited to disclosure of session-cookie data.

The record

CVE
CVE-2023-5035
Published
Nov 2, 2023
Updated
Sep 5, 2024
Vendor
Moxa
Product
PT-G503 Series
Classifications
CWE-319, CWE-614, T1557
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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
CWE-614Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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