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

Vulnerability summary

CVE-2026-15701 is a high (CVSS 10.0) vulnerability in totolink nr1800x_firmware. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 14-07-2026
   PublishedVulnerability first disclosed.
2. 15-07-2026
   Last modifiedVulnerability information updated.

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.

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferThe product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).