CVE-2025-9303: totolink a720r_firmware

Vulnerability summary

CVE-2025-9303 is a critical (CVSS 9.8) vulnerability in totolink a720r_firmware. EPSS estimates a 0.90% chance of exploitation in the next 30 days, higher than 59.1% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 21-08-2025
   PublishedVulnerability first disclosed.
2. 21-08-2025
   Last modifiedVulnerability information updated.

Description

A security flaw has been discovered in TOTOLINK A720R 4.1.5cu.630_B20250509. This issue affects the function setParentalRules of the file /cgi-bin/cstecgi.cgi. Performing manipulation of the argument desc results in buffer overflow. The attack is possible to be carried out remotely. The exploit has been released to the public and may be exploited.

• 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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.