CVE-2026-2567: Wavlink WL-NU516U1 nas.cgi sub_401218 stack-based overflow

Vulnerability summary

CVE-2026-2567 is a high (CVSS 8.6) vulnerability in wavlink wl-nu516u1_firmware. EPSS estimates a 1.25% chance of exploitation in the next 30 days, higher than 69.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 16-02-2026
   PublishedVulnerability first disclosed.
2. 23-02-2026
   Last modifiedVulnerability information updated.

Description

A vulnerability was detected in Wavlink WL-NU516U1 20251208. This vulnerability affects the function sub_401218 of the file /cgi-bin/nas.cgi. Performing a manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack may be initiated remotely. The exploit is now public and may be used.

• 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).
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.