Cyber Resilience

CVE-2024-33896

RCE in Hms-Networks Ewon Cosy\+ Firmware 21.0 – 21.2s10

Public PoCRCECommand Injection
Published
02 August 2024
Modified
04 November 2025
Patch / advisory
View advisory
CVSS Score v3.1 7.2
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.040 90th percentile
Risk Priority 65 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2024-33896 is a high-severity OS Command Injection (CWE-78) vulnerability in Hms-Networks Ewon Cosy\+ Firmware. Its CVSS base score is 7.2 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Command and Scripting Interpreter (T1059); ranked in the top 10% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified map to SA-11 (Developer Testing and Evaluation) and SI-10 (Information Input Validation) — see the control section below for these in your framework.

Deeper analysis AI-assisted summary

Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.

Cosy+ industrial remote access gateways running firmware versions 21.x prior to 21.2s10 or 22.x prior to 22.1s3 contain a code injection vulnerability (CWE-78) stemming from improper parameter blacklisting. The flaw affects the device's web interface or configuration handling and carries a CVSS 3.1 score of 7.2 with network attack vector and high privileges required.

An authenticated attacker with administrative access can supply crafted parameters that result in arbitrary command execution on the underlying system, yielding full control over confidentiality, integrity, and availability of the device. Exploitation is possible remotely without user interaction once high-privilege credentials are obtained.

Vendor advisories from HMS Networks and Ewon recommend immediate upgrade to firmware 21.2s10 or 22.1s3, which correct the blacklisting logic. Public disclosure materials, including a detailed technical analysis and the official HMS security advisory, outline the affected product lines and patch availability.

The associated EPSS score has remained in the 0.17–0.19 range with no pronounced post-disclosure increase.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability Data

Cosy+ devices running a firmware 21.x below 21.2s10 or a firmware 22.x below 22.1s3 are vulnerable to code injection due to improper parameter blacklisting. This is fixed in version 21.2s10 and 22.1s3.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise Techniques

T1059 Command and Scripting Interpreter Execution
Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries.
attack.mitre.org →
T1059.003 Windows Command Shell Execution
Adversaries may abuse the Windows command shell for execution.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
T1059.001 PowerShell Execution
Adversaries may abuse PowerShell commands and scripts for execution.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-33897Same product: Hms-Networks Ewon Cosy\+ 4G Apac
CVE-2024-33893Same product: Hms-Networks Ewon Cosy\+ 4G Apac
CVE-2024-33892Same product: Hms-Networks Ewon Cosy\+ 4G Apac
CVE-2024-33894Same product: Hms-Networks Ewon Cosy\+ 4G Apac
CVE-2024-33895Same product: Hms-Networks Ewon Cosy\+ 4G Apac
CVE-2025-8628Shared CWE-78
CVE-2024-22836Shared CWE-78
CVE-2023-25826Shared CWE-78
CVE-2026-65590Shared CWE-78
CVE-2026-72880Shared CWE-78

Affected Assets

hms-networks
ewon cosy\+ firmware
21.0 — 21.2s10 · 22.0 — 22.1s3

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.2.5
  • V1.2.8
  • V15.2.5

Mitigating Controls (NIST 800-53 r5) AI

SA-11 Developer Testing and Evaluation good match

Developer testing and evaluation can discover missing or incorrect command sanitization during development.

SI-10 Information Input Validation good match

Input validation directly neutralizes or rejects special characters that would otherwise alter OS command structure.

AC-6 Least Privilege partial match

Least privilege reduces the permissions available to any process that could be subverted by injected commands.

CM-7 Least Functionality partial match

Least functionality restricts available OS commands and interpreters, limiting the blast radius of injection.

SA-8 Security and Privacy Engineering Principles partial match

Secure engineering principles require proper neutralization of untrusted input before command construction.

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.PS-06 mostly match
prevents

PR.PS-06's SDLC practices directly require secure coding and input handling that blocks command-injection defects, yet the single broad outcome leaves many specific neutralization vectors and verification gaps unaddressed.

PR.PS-02 partial match
prevents

Routine patching/maintenance can remediate known command-injection CVEs in dependencies (partial forward) but does nothing to stop developers from introducing improper neutralization in custom code (none reverse).

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 and code review target insecure use of operating-system command interfaces, catching command-injection flaws introduced during development.

References