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.

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…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (12.0th percentile) — read the EPSS interpretation.

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.

Affected products

Totolink Nr1800x — versions 9.1.0u.6279_B20210910

Weakness classification (CWE)

References

VDB-360357 | Totolink NR1800X lighttpd find_host_ip stack-based overflow (technical-description, vdb-entry)
VDB-360357 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #804404 | Totolink C834FR-1C NR1800X 内存损坏 (third-party-advisory)
cna@vuldb.com (exploit)
cna@vuldb.com (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.