Buffer overflow in Totolink Nr1800x
CVE-2026-15701
A weakness has been identified in Totolink NR1800X 9.1.0u.6279_B20210910. Affected by this issue is the function Form_Logout of the file /formLogout.htm of the component lighttpd. This manipulation of the argument Host causes stack-based buffer overflow. The attack is possible to be carried out 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 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: 0.011 (65.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 65.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Totolink Nr1800x — versions 9.1.0u.6279_B20210910
Weakness classification (CWE)
References
- vuldb.com/vuln/378248 (technical-description, vdb-entry)
- vuldb.com/vuln/378248/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-15701 (third-party-advisory)
- vuldb.com/submit/856136 (third-party-advisory)
- github.com/fu9-dotom/cve/issues/1 (issue-tracking, exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-15701?
- CVE-2026-15701 is a critical-severity vulnerability in Totolink Nr1800x, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-07-14.
- How severe is CVE-2026-15701?
- Critical severity. CVSS v3 base score is 9.8 out of 10.