What is CVE-2026-7750?

CVE-2026-7750 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-2026-7750?

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

Buffer overflow in Totolink N300rh

CVE-2026-7750

A vulnerability was detected in Totolink N300RH 3.2.4-B20220812. This vulnerability affects the function setMacFilterRules of the file /cgi-bin/cstecgi.cgi of the component POST Request Handler. The manipulation of the argument mac_address results in buffer overflow. The attack may be launched remotely. The exploit is now public and may be used.

Vulnerability class: Buffer Overflow

Published 2026-05-04 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.008 (54.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.003

Affected products

Totolink N300rh — versions 3.2.4-B20220812

Weakness classification (CWE)

References

lavender-bicycle-a5a.notion.site/TOTOLINK-N300RH-setMacFilterRules-34553a41781f… (exploit)
vuldb.com/submit/807204 (third-party-advisory)
vuldb.com/vuln/360925 (technical-description, vdb-entry)
vuldb.com/vuln/360925/cti (signature, permissions-required)
www.totolink.net/ (product)

Frequently asked questions

What is CVE-2026-7750?: CVE-2026-7750 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-2026-7750?: High severity. CVSS v3 base score is 8.8 out of 10.