How severe is CVE-2025-51630?

CVE-2025-51630 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-51630 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-51630?

CVE-2025-51630 affects Totolink N350rt Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-51630?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-51630 have an EU (EUVD) identifier?

Yes. CVE-2025-51630 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21773.

When was CVE-2025-51630 published?

CVE-2025-51630 was published on 2025-07-17 and last updated on 2026-06-17.

CVE-2025-51630

CVE-2025-51630 is a critical-severity vulnerability in Totolink N350rt Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-21773
Weakness: CWE-120
Affected product: Totolink N350rt Firmware
Published: 2025-07-17
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-51630?: TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a buffer overflow via the ePort parameter in the function setIpPortFilterRules.
How severe is CVE-2025-51630?: CVE-2025-51630 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-51630 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-51630?: CVE-2025-51630 affects Totolink N350rt Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-51630?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-51630 have an EU (EUVD) identifier?: Yes. CVE-2025-51630 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-21773.
When was CVE-2025-51630 published?: CVE-2025-51630 was published on 2025-07-17 and last updated on 2026-06-17.

References

https://github.com/luckysmallbird/Totolink-N350RT-Vulnerability/blob/main/1-ePort.md

Affected products (1)

cpe:2.3:o:totolink:n350rt_firmware:9.3.5u.6139_b20201216:*:*:*:*:*:*:*

More vulnerabilities in Totolink N350rt Firmware

CVE-2024-42966 — Critical (CVSS 9.8): Incorrect access control in TOTOLINK N350RT V9.3.5u.6139_B20201216 allows attackers to obtain the apmib configuration…
CVE-2024-7462 — High (CVSS 8.8): A vulnerability classified as critical has been found in TOTOLINK N350RT 9.3.5u.6139_B20201216. This affects the…
CVE-2024-7333 — High (CVSS 8.8): A vulnerability was found in TOTOLINK N350RT 9.3.5u.6139_B20201216. It has been declared as critical. This…
CVE-2022-36488 — High (CVSS 7.8): TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a stack overflow via the sPort parameter in the…
CVE-2022-36487 — High (CVSS 7.8): TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a command injection vulnerability via the command…
CVE-2022-36486 — High (CVSS 7.8): TOTOLINK N350RT V9.3.5u.6139_B20201216 was discovered to contain a command injection vulnerability via the FileName…

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