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PatchSiren cyber security CVE debrief

CVE-2024-7755 HMS Networks CVE debrief

The HMS Networks EWON FLEXY 202 industrial gateway transmits credentials using Base64 encoding without encryption, enabling network-level attackers to capture and decode authentication material via passive traffic analysis. Published 2024-10-17, this HIGH severity vulnerability (CVSS 8.2) affects Firmware version 14.2s0. The attack requires no privileges and low attack complexity, with network access and user interaction as prerequisites. The confidentiality impact is rated HIGH, with LOW integrity impact. HMS Networks has released firmware version 14.9s2 to address this weakness. Organizations should prioritize updating affected devices and implementing network segmentation controls to limit credential exposure.

Vendor
HMS Networks
Product
EWON FLEXY 202
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2024-10-17
Original CVE updated
2024-10-17
Advisory published
2024-10-17
Advisory updated
2024-10-17

Who should care

Organizations operating HMS Networks EWON FLEXY 202 industrial gateways in manufacturing, energy, water/wastewater, and other OT environments. Security teams responsible for industrial network segmentation and credential protection. Compliance officers managing IEC 62443 or NIST CSF alignment for industrial control systems.

Technical summary

The EWON FLEXY 202 industrial gateway uses Base64 encoding—a reversible encoding scheme, not encryption—for credential transmission. Base64 provides no confidentiality protection; encoded credentials decode trivially with standard tools. An attacker with network access can passively capture traffic containing authentication exchanges and recover plaintext credentials. The vulnerability exists in Firmware 14.2s0. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N) reflects network attack vector, low complexity, no privileges required, user interaction needed, scope change, high confidentiality impact, and low integrity impact. HMS Networks has addressed this in firmware 14.9s2.

Defensive priority

HIGH

Recommended defensive actions

  • Update EWON FLEXY 202 devices to firmware version 14.9s2 or later as recommended by HMS Networks
  • Implement network segmentation to isolate industrial control system devices from untrusted networks
  • Deploy encrypted management channels (VPN, TLS) for all remote access to affected devices
  • Monitor network traffic for unauthorized credential capture attempts on industrial segments
  • Review and rotate credentials that may have been exposed prior to patching
  • Apply CISA ICS recommended practices for defense-in-depth architecture
  • Validate that replacement firmware implements proper credential encryption rather than encoding

Evidence notes

CISA ICS advisory ICSA-24-291-04 confirms Base64 credential encoding in EWON FLEXY 202 Firmware 14.2s0. CVSS vector AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N sourced from official CISA CSAF document. Remediation guidance and firmware update path (14.9s2) provided by vendor through CISA-coordinated disclosure.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-7755 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-7755

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-7755 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-7755

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2024/icsa-24-291-04.json

    cisa_csaf

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/news-events/ics-advisories/icsa-24-291-04

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/resources-tools/resources/ics-recommended-practices

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/topics/industrial-control-systems

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/sites/default/files/publications/emailscams0905.pdf

    Reference

  • Source reference

    Unverified legacy reference

    URL: https://www.cisa.gov/uscert/ncas/tips/ST04-014

    Reference

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.