CVE-2026-82539: totolink a720r_firmware

Vulnerability summary

CVE-2026-82539 is a critical (CVSS 9.4) vulnerability in totolink a720r_firmware. EPSS estimates a 0.83% chance of exploitation in the next 30 days, higher than 57.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 30-08-2026
   PublishedVulnerability first disclosed.
2. 01-09-2026
   Last modifiedVulnerability information updated.

Description

A vulnerability was determined in TOTOLINK A720R 4.1.5cu.630_B20250509. This impacts the function setMacFilterRules of the file cstecgi.cgi of the component MAC Filtering. Executing a manipulation of the argument desc can lead to memory corruption. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

• 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.