CVE-2021-27705: tenda g1_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2021-27705 is a critical (CVSS 9.8) Classic Buffer Overflow vulnerability in tenda g1_firmware. EPSS estimates a 2.94% chance of exploitation in the next 30 days, higher than 87% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 14-04-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/"qosIndex "request. This occurs because the "formQOSRuleDel" function directly passes the parameter "qosIndex" to strcpy without limit.

• 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.