CVE-2025-52089: A hidden remote support feature protected by a static secret in TOTOLINK N300RB firmware version 8.54 allows a

This week

HIGH 8.8MITIGATE

CVE-2025-52089 is a high-severity flaw (CVSS 8.8) affecting n300rb firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A hidden remote support feature protected by a static secret in TOTOLINK N300RB firmware version 8.54 allows an authenticated attacker to execute arbitrary OS commands with root privileges.

Why this priority

High severity
EPSS top 5%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	9.7% (top 5%)
CISA exploited list	No
Weakness	CWE-306
Published	2025-07-11
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: totolink

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

Am I affected?

Timeline

2025-07-11 15:15 UTCPublished CVE record published
2026-06-17 09:36 UTCUpdated Record last modified

totolink n300rb firmware MITIGATE

Affected: 8.54

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.54

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.

Public exploits and detection

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

Exploit-DB: TOTOLINK N300RB 8.54 - Command Execution

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-2025-52089?

n300rb firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-52089 being exploited?

CVE-2025-52089 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-2025-52089 affect?

CVE-2025-52089 affects n300rb firmware. Severity is high (CVSS 8.8). A hidden remote support feature protected by a static secret in TOTOLINK N300RB firmware version 8.54 allows an authenticated attacker to execute arbitrary OS commands with root privileges.

How urgent is CVE-2025-52089?

Priority 60/100. High severity; EPSS top 5%: very likely to be exploited; Public exploit reference

References

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