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 FileName can lead to buffer overflow. The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks.
Vulnerability class: Buffer Overflow
Published · last modified .
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 .
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-setUpgradeFW-34553a41781f80abb… (exploit, patch)
- vuldb.com/submit/807202 (third-party-advisory)
- vuldb.com/vuln/360923 (technical-description, vdb-entry)
- vuldb.com/vuln/360923/cti (signature, permissions-required)
- www.totolink.net/ (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.