How severe is CVE-2025-6400?

CVE-2025-6400 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-6400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-6400?

CVE-2025-6400 affects Totolink N300rh Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-6400?

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

Does CVE-2025-6400 have an EU (EUVD) identifier?

Yes. CVE-2025-6400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18805.

When was CVE-2025-6400 published?

CVE-2025-6400 was published on 2025-06-21 and last updated on 2026-06-17.

CVE-2025-6400

CVE-2025-6400 is a high-severity vulnerability in Totolink N300rh Firmware with a CVSS 3.x base score of 8.8. 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-119.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18805
Weakness: CWE-119
Affected product: Totolink N300rh Firmware
Published: 2025-06-21
Last modified: 2026-06-17

Description

A vulnerability was found in TOTOLINK N300RH 6.1c.1390_B20191101 and classified as critical. Affected by this issue is some unknown functionality of the file /boafrm/formPortFw of the component HTTP POST Message Handler. The manipulation of the argument service_type leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Frequently asked questions

What is CVE-2025-6400?: A vulnerability was found in TOTOLINK N300RH 6.1c.1390_B20191101 and classified as critical. Affected by this issue is some unknown functionality of the file /boafrm/formPortFw of the component HTTP POST Message Handler. The manipulation of the argument service_type leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.
How severe is CVE-2025-6400?: CVE-2025-6400 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-6400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-6400?: CVE-2025-6400 affects Totolink N300rh Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-6400?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-6400 have an EU (EUVD) identifier?: Yes. CVE-2025-6400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18805.
When was CVE-2025-6400 published?: CVE-2025-6400 was published on 2025-06-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:totolink:n300rh_firmware:6.1c.1390_b20191101:*:*:*:*:*:*:*

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