CVE-2024-42936: The mqlink.elf is service component in Ruijie RG-EW300N with firmware ReyeeOS 1.300.1422 is vulnerable to Remo

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CRITICAL 9.8REMOTEMITIGATE

CVE-2024-42936 is a critical-severity flaw (CVSS 9.8) affecting reyee os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The mqlink.elf is service component in Ruijie RG-EW300N with firmware ReyeeOS 1.300.1422 is vulnerable to Remote Code Execution via a modified MQTT broker message.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-94
Published	2025-01-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ruijie

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-01-21 20:15 UTCPublished CVE record published
2026-06-17 07:50 UTCUpdated Record last modified

ruijie reyee os MITIGATE

Affected: 1.300.1422

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.300.1422

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-42936?

reyee os: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-42936 being exploited?

CVE-2024-42936 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-42936 affect?

CVE-2024-42936 affects reyee os. Severity is critical (CVSS 9.8). The mqlink.elf is service component in Ruijie RG-EW300N with firmware ReyeeOS 1.300.1422 is vulnerable to Remote Code Execution via a modified MQTT broker message.

How urgent is CVE-2024-42936?

Priority 61/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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