What is CVE-2025-6400?

CVE-2025-6400 is a high-severity vulnerability in Totolink N300rh, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-06-21.

How severe is CVE-2025-6400?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Totolink N300rh

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 o…

Vulnerability class: Buffer Overflow

EPSS: 0.014 (80.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

Totolink N300rh — versions 6.1c.1390_B20191101

Weakness classification (CWE)

References

VDB-313394 | TOTOLINK N300RH HTTP POST Message formPortFw buffer overflow (vdb-entry, technical-description)
VDB-313394 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #597687 | TOTOLINK N300RH_V4 V6.1c.1390_B20191101 Buffer Overflow (third-party-advisory)
github.com/d2pq/cve/blob/main/616/20.md (related)
github.com/d2pq/cve/blob/main/616/20.md (exploit)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2025-6400?: CVE-2025-6400 is a high-severity vulnerability in Totolink N300rh, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-06-21.
How severe is CVE-2025-6400?: High severity. CVSS v3 base score is 8.8 out of 10.