CVE-2025-6751: Linksys E8450 HTTP POST Request portal.cgi set_device_language buffer overflow

Vulnerability summary

CVE-2025-6751 is a high (CVSS 9.0) vulnerability in linksys e8450_firmware. EPSS estimates a 0.78% chance of exploitation in the next 30 days, higher than 55.5% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 27-06-2025
   PublishedVulnerability first disclosed.
2. 27-06-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability, which was classified as critical, was found in Linksys E8450 up to 1.2.00.360516. This affects the function set_device_language of the file portal.cgi of the component HTTP POST Request Handler. The manipulation of the argument dut_language leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

• 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.