What is CVE-2026-7748?

CVE-2026-7748 is a high-severity vulnerability in Totolink N300rh, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-05-04.

How severe is CVE-2026-7748?

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

Buffer overflow in Totolink N300rh

CVE-2026-7748

A weakness has been identified in Totolink N300RH 3.2.4-B20220812. Affected by this issue is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. Executing a manipulation of the argument FileNam…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (24.8th 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.

Affected products

Totolink N300rh — versions 3.2.4-B20220812

Weakness classification (CWE)

References

cna@vuldb.com (exploit, patch)
Submit #807202 | Totolink N300RH N300RH V3_Firmware V3.2.4-B20220812 Buffer Overflow (third-party-advisory)
VDB-360923 | Totolink N300RH POST Request cstecgi.cgi setUpgradeFW buffer overflow (technical-description, vdb-entry)
VDB-360923 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-7748?: CVE-2026-7748 is a high-severity vulnerability in Totolink N300rh, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-05-04.
How severe is CVE-2026-7748?: High severity. CVSS v3 base score is 8.8 out of 10.