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 Password results in buffer overflow. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks.

Vulnerability class: Buffer Overflow

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

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.

EPSS exploit prediction

EPSS: 0.010 (62.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.004

Affected products

Totolink N300rh — versions 3.2.4-B20220812

Weakness classification (CWE)

References

lavender-bicycle-a5a.notion.site/TOTOLINK-N300RH-loginauth_password-34553a41781… (exploit)
vuldb.com/submit/807201 (third-party-advisory)
vuldb.com/vuln/360922 (technical-description, vdb-entry)
vuldb.com/vuln/360922/cti (signature, permissions-required)
www.totolink.net/ (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.