CVE-2025-51630: TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a buffer overflow via the ePort parameter in

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CRITICAL 9.8REMOTEMITIGATE

CVE-2025-51630 is a critical-severity flaw (CVSS 9.8) affecting n350rt firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a buffer overflow via the ePort parameter in the function setIpPortFilterRules.

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	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-120
Published	2025-07-17
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

2025-07-17 14:15 UTCPublished CVE record published
2026-06-17 09:35 UTCUpdated Record last modified

totolink n350rt firmware MITIGATE

Affected: 9.3.5u.6139_b20201216

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.3.5u.6139_b20201216

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-2025-51630?

n350rt firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-51630 being exploited?

CVE-2025-51630 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-2025-51630 affect?

CVE-2025-51630 affects n350rt firmware. Severity is critical (CVSS 9.8). TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a buffer overflow via the ePort parameter in the function setIpPortFilterRules.

How urgent is CVE-2025-51630?

Priority 55/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-7462 HIGH 8.8 MITIGATE A vulnerability classified as critical has been found in TOTOLINK N350RT 9.3.5u.6139_B20201216
CVE-2024-7333 HIGH 8.8 MITIGATE A vulnerability was found in TOTOLINK N350RT 9.3.5u.6139_B20201216
CVE-2024-42966 CRITICAL 9.8 MITIGATE Incorrect access control in TOTOLINK N350RT V9.3.5u.6139_B20201216 allows attackers to obtain the apmib config
CVE-2024-0943 LOW 3.7 MITIGATE A vulnerability was found in Totolink N350RT 9.3.5u.6255

References

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