What is CVE-2026-7747?

CVE-2026-7747 is a critical-severity vulnerability in Totolink N300rh, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-05-04.

How severe is CVE-2026-7747?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Totolink N300rh

CVE-2026-7747

A security flaw has been discovered in Totolink N300RH 3.2.4-B20220812. Affected by this vulnerability is the function loginauth of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. Performing a manipulation of the argument…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (27.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Totolink N300rh — versions 3.2.4-B20220812

Weakness classification (CWE)

References

cna@vuldb.com (exploit)
Submit #807201 | Totolink N300RH N300RH V3_Firmware V3.2.4-B20220812 Buffer Overflow (third-party-advisory)
VDB-360922 | Totolink N300RH Parameter cstecgi.cgi loginauth buffer overflow (technical-description, vdb-entry)
VDB-360922 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-7747?: CVE-2026-7747 is a critical-severity vulnerability in Totolink N300rh, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-05-04.
How severe is CVE-2026-7747?: Critical severity. CVSS v3 base score is 9.8 out of 10.