Cyber Resilience

CVE-2023-4217

Moxa Eds-G503 Firmware ≤ 5.2

Published
02 November 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 3.1
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS Score 0.0032 25th percentile
Risk Priority 28 floored blend · peak EPSS

Summary

CVE-2023-4217 is a low-severity Sensitive Cookie Without 'HttpOnly' Flag (CWE-1004) vulnerability in Moxa Eds-G503 Firmware. Its CVSS base score is 3.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Cloud Instance Metadata API (T1552.005); ranked at the 25th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access ControlA02:2025 Security Misconfiguration

EU & UK References

Vulnerability Data

A vulnerability has been identified in PT-G503 Series versions prior to v5.2, where the session cookies attribute is not set properly in the affected application. The vulnerability may lead to security risks, potentially exposing user session data to unauthorized access…

more

and manipulation.

CWE(s)
CWE-1004CWE-668

Related Threats

MITRE ATT&CK Enterprise Techniques

T1552.005 Cloud Instance Metadata API Credential Access
Adversaries may attempt to access the Cloud Instance Metadata API to collect credentials and other sensitive data.
attack.mitre.org →
T1552.007 Container API Credential Access
Adversaries may gather credentials via APIs within a containers environment.
attack.mitre.org →
T1039 Data from Network Shared Drive Collection
Adversaries may search network shares on computers they have compromised to find files of interest.
attack.mitre.org →
T1530 Data from Cloud Storage Collection
Adversaries may access data from cloud storage.
attack.mitre.org →
T1539 Steal Web Session Cookie Credential Access
An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.
attack.mitre.org →
T1552 Unsecured Credentials Credential Access
Adversaries may search compromised systems to find and obtain insecurely stored credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-5035Same product: Moxa Eds-G503
CVE-2023-4230Same vendor: Moxa
CVE-2023-4228Same vendor: Moxa
CVE-2024-6785Same vendor: Moxa
CVE-2023-4204Same vendor: Moxa
CVE-2024-4740Same vendor: Moxa
CVE-2023-39982Same vendor: Moxa
CVE-2023-33236Same vendor: Moxa
CVE-2026-0715Same vendor: Moxa
CVE-2023-5962Same vendor: Moxa

Affected Assets

moxa
eds-g503 firmware
≤ 5.2

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 8 hardening rules · 7 OS baselines
Validate
Prove the fix (OWASP ASVS)

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Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AC-20 Use of External Systems
addresses: CWE-668

Controls whether organization resources are exposed to external system spheres by permitting or prohibiting their use.

AC-21 Information Sharing
addresses: CWE-668

The control ensures information is not released into a security sphere where the recipient lacks matching access authorizations.

AC-22 Publicly Accessible Content
addresses: CWE-668

The control ensures information resources are not exposed to the incorrect (public) sphere through review and authorization.

AC-23 Data Mining Protection
addresses: CWE-668

Protects against data mining that would expose resources to unauthorized spheres by enforcing detection and controls.

AC-4 Information Flow Enforcement
addresses: CWE-668

Restricts information flows to ensure resources are not exposed to incorrect or unauthorized spheres.

CA-9 Internal System Connections
addresses: CWE-668

Controlling internal connections prevents exposure of resources to unintended internal spheres.

CM-12 Information Location
addresses: CWE-668

Knowing exact processing and storage locations helps avoid exposure of resources to incorrect spheres.

MP-2 Media Access
addresses: CWE-668

The control prevents exposure of the media resource to the wrong security sphere.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-05 mostly match
prevents

Enforcing least-privilege authorizations directly prevents resources from being exposed outside their intended control sphere.

PR.PS-06 mostly match
prevents

Broad SDLC practices catch cookie-handling defects via standards/testing (mostly forward) yet remain too general to guarantee this narrow flag setting is always enforced (partial reverse).

PR.AT-02 partial match
prevents

Role-based training can reduce the chance developers introduce missing HttpOnly flags but supplies no enforcement or detection, leaving essentially all of the implementation flaw's risk intact.

PR.IR-01 partial match
prevents

Network segmentation and unauthorized-access protections reduce the chance of resources being reachable by the wrong sphere.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect missing HttpOnly flags but does not prevent the weakness.

A.8.22 Segregation of networks partial match
mitigates

Placing systems of differing trust levels into separate domains prevents resources from being placed in a sphere where they are reachable by unintended actors.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate HttpOnly on sensitive cookies.

A.8.28 Secure coding partial match
prevents

Secure coding standards explicitly require the HttpOnly flag for sensitive cookies.

A.5.9 Inventory of information and other associated assets none match
none

Requiring owners to manage the full asset life cycle and remove assets from the inventory upon secure disposal helps prevent resources from being inadvertently exposed outside their intended security sphere.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (2 rules)
  • V-248827 OL 8 must not have the rsh-server package installed. prevents CWE-668
  • V-248823 OL 8 must not have the telnet-server package installed. prevents CWE-668
RHEL 7 (1 rule)
  • V-204442 The Red Hat Enterprise Linux operating system must not have the rsh-server package installed. prevents CWE-668
Windows 10 (1 rule)
  • V-220967 The Debug programs user right must only be assigned to the Administrators group. prevents CWE-668
Windows 11 (1 rule)
  • V-253490 The "Debug programs" user right must only be assigned to the Administrators group. prevents CWE-668
Windows Server 2016 (1 rule)
  • V-225079 The Debug programs user right must only be assigned to the Administrators group. prevents CWE-668
Windows Server 2019 (1 rule)
  • V-205757 Windows Server 2019 Debug programs: user right must only be assigned to the Administrators group. prevents CWE-668
Windows Server 2022 (1 rule)
  • V-254500 Windows Server 2022 debug programs user right must only be assigned to the Administrators group. prevents CWE-668

References