CVE-2025-55847: Wavlink M86X3A_V240730 contains a buffer overflow vulnerability in the /cgi-bin/ExportAllSettings.cgi file

This month

HIGH 8.8MITIGATE

CVE-2025-55847 is a high-severity flaw (CVSS 8.8) affecting wl-wn586x3a firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Wavlink M86X3A_V240730 contains a buffer overflow vulnerability in the /cgi-bin/ExportAllSettings.cgi file. The vulnerability arises because the Cookie parameter does not properly validate the length of input data. Attackers can exploit this to execute arbitrary code or cause a denial of service (DoS) on the system

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-09-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: wavlink

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

Am I affected?

Timeline

2025-09-26 18:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

wavlink wl-wn586x3a firmware MITIGATE

Affected: m86x3a_v240730

Fixed in: no fixed release known

Safe to downgrade to: a release before m86x3a_v240730

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.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · pipx · FIXED · 1.18.9-1.fc46 · FEDORA-2026-95305954ab · source

sudo dnf upgrade --advisory=FEDORA-2026-95305954ab

Fedora ELN · libisds · FIXED · 0.11.2-19.eln159 · FEDORA-2026-bf61b68668 · source

sudo dnf upgrade --advisory=FEDORA-2026-bf61b68668

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/meigui637/iot_zone/blob/main/%E6%A0%88%E6%BA%A2%E5%87%BA%E6%BC%8F%E6%B4%9E.md

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-2025-55847?

wl-wn586x3a firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-55847 being exploited?

CVE-2025-55847 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-2025-55847 affect?

CVE-2025-55847 affects wl-wn586x3a firmware. Severity is high (CVSS 8.8). Wavlink M86X3A_V240730 contains a buffer overflow vulnerability in the /cgi-bin/ExportAllSettings.cgi file. The vulnerability arises because the Cookie parameter does not properly validate the length of input data. Attackers can exploit thi

How urgent is CVE-2025-55847?

Priority 56/100. High severity; Public exploit reference

References

← Back to latest CVEs