Buffer Overflow in Tenda G1 and G3 Routers by Tenda
CVE-2021-27705

9.8CRITICAL

Key Information:

Vendor

Tenda
Status
G1 Firmware
Vendor
CVE Published:
14 April 2021

What is CVE-2021-27705?

A buffer overflow vulnerability exists in Tenda G1 and G3 routers operating on firmware version v15.11.0.17(9502)_CN. This flaw allows remote attackers to execute arbitrary code by sending specially crafted requests that exploit the 'formQOSRuleDel' function. The function inadequately handles the 'qosIndex' parameter, leading to unchecked copying of data into fixed-size memory buffers, thereby allowing for potential remote exploitation.

References

https://hackmd.io/Zb7lfFaNR0ScpaTssECFbg
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-2021-27705 : Buffer Overflow in Tenda G1 and G3 Routers by Tenda