CVE-2025-7854: Tenda FH451 VirtualSer fromVirtualSer stack-based overflow

Vulnerability summary

CVE-2025-7854 is a high (CVSS 9.0) vulnerability in tenda fh451_firmware. EPSS estimates a 1.24% chance of exploitation in the next 30 days, higher than 68.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 19-07-2025
   PublishedVulnerability first disclosed.
2. 22-07-2025
   Last modifiedVulnerability information updated.

Description

A vulnerability classified as critical has been found in Tenda FH451 1.0.0.9. Affected is the function fromVirtualSer of the file /goform/VirtualSer. The manipulation of the argument page leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the 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).