Buffer Overflow Vulnerability in Tenda G1 and G3 Routers
CVE-2021-27707

9.8CRITICAL

Key Information:

Vendor

Tenda
Status
G1 Firmware
Vendor
CVE Published:
14 April 2021

What is CVE-2021-27707?

A critical buffer overflow vulnerability exists in Tenda G1 and G3 routers running firmware v15.11.0.17(9502)_CN. This flaw allows remote attackers to execute arbitrary code on the affected devices by sending a specially crafted request that exploits the 'formDelPortMapping' function. The function improperly handles the 'portMappingIndex' parameter, passing it directly to the strcpy function without adequate bounds checking. This oversight can lead to system compromise and unauthorized access, highlighting the need for timely updates and robust network security practices.

References

https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw
x_refsource_MISC

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2021-27707 : Buffer Overflow Vulnerability in Tenda G1 and G3 Routers