Vulnerability · Published Jul 14, 2026 · Assigned by VulDB

CVE-2026-15701Totolink NR1800X lighttpd formLogout.htm Form_Logout stack-based overflow

Critical 9.8

In plain English

A critical-severity stack buffer overflow in NR1800X from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.1%top 34.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Totolink	NR1800X	9.1.0u.6279_B20210910

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-378248 | Totolink NR1800X lighttpd formLogout.htm Form_Logout stack-based overflow vdb-entry, technical-description
VDB-378248 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-15701 | CVE Analysis and Report third-party-advisory
Submit #856136 | TOTOLINK TOTOLINK NR1800X V9.1.0u.6279_B20210910 V9.1.0u.6279_B20210910 Buffer Overflow third-party-advisory
https://github.com/fu9-dotom/cve/issues/1 exploit, issue-tracking
https://www.totolink.net/ product