Buffer overflow in Totolink Nr1800x
CVE-2026-7546
A security vulnerability has been detected in Totolink NR1800X 9.1.0u.6279_B20210910. The impacted element is the function find_host_ip of the component lighttpd. Such manipulation of the argument Host leads to stack-based buffer overflow. The attack can be executed remotely. The exploit has been disclosed publicly and may be used.
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: 0.010 (62.0th percentile), scored .
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: 0.008 · newest: 0.010 · change: +0.003
Affected products
- Totolink Nr1800x — versions 9.1.0u.6279_B20210910
Weakness classification (CWE)
References
- vuldb.com/vuln/360357 (technical-description, vdb-entry)
- vuldb.com/vuln/360357/cti (signature, permissions-required)
- vuldb.com/submit/804404 (third-party-advisory)
- github.com/newym/cve/blob/main/totolinknr1800x.md (exploit)
- www.totolink.net/ (product)
Frequently asked questions
- What is CVE-2026-7546?
- CVE-2026-7546 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 2026-05-01.
- How severe is CVE-2026-7546?
- Critical severity. CVSS v3 base score is 9.8 out of 10.