CVE-2025-60335: A NULL pointer dereference in the main function of TOTOLINK N600R v4.3.0cu.7866_B20220506 allows attackers to

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HIGH 7.5REMOTEMITIGATE

CVE-2025-60335 is a high-severity flaw (CVSS 7.5) affecting n600r firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A NULL pointer dereference in the main function of TOTOLINK N600R v4.3.0cu.7866_B20220506 allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-476
Published	2025-10-22
Last modified	2026-10-27

Publisher (CNA): MITRE · Vendor: totolink

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-10-22 16:15 UTCPublished CVE record published
2026-10-27 12:10 UTCUpdated Record last modified

totolink n600r firmware MITIGATE

Affected: 4.3.0cu.7866_b20220506

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.0cu.7866_b20220506

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 · ruff · FIXED · 0.17.3-1.fc46 · FEDORA-2026-63898fdcbb · source

sudo dnf upgrade --advisory=FEDORA-2026-63898fdcbb

Fedora ELN · xorg-x11-server-Xwayland · FIXED · 26.0.99.903-2.eln159 · FEDORA-2026-4581dab0ed · source

sudo dnf upgrade --advisory=FEDORA-2026-4581dab0ed

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/z472421519/BinaryAudit/blob/main/PoC/NPD/TOTOLink/main/CONTENT_LENGTH_MAX.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-2025-60335?

n600r firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-60335 being exploited?

CVE-2025-60335 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-2025-60335 affect?

CVE-2025-60335 affects n600r firmware. Severity is high (CVSS 7.5). A NULL pointer dereference in the main function of TOTOLINK N600R v4.3.0cu.7866_B20220506 allows attackers to cause a Denial of Service (DoS) via a crafted HTTP request.

How urgent is CVE-2025-60335?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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