CVE-2024-4020: Tenda FH1206 addressNat fromAddressNat buffer overflow

Vulnerability summary

CVE-2024-4020 is a high (CVSS 9.0) Classic Buffer Overflow vulnerability in tenda fh1206_firmware. EPSS estimates a 1.57% chance of exploitation in the next 30 days, higher than 75.2% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 20-04-2024
   PublishedVulnerability first disclosed.
2. 01-08-2024
   Last modifiedVulnerability information updated.

Description

A vulnerability was found in Tenda FH1206 1.2.0.8(8155) and classified as critical. This issue affects the function fromAddressNat of the file /goform/addressNat. The manipulation of the argument entrys leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-261671. NOTE: The vendor was contacted early about this disclosure but did not respond in any way.

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