CVE-2021-27707 — CRITICAL (9.8)

Vulnerability 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/"portMappingIndex "request. This occurs because the "formDelPortMapping" function directly passes the parameter "portMappingIndex" to strcpy without limit.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Tenda	G1 Firmware	v15.11.0.17\(9502\)_cn
Tenda	G1	-
Tenda	G3 Firmware	v15.11.0.17\(9502\)_cn
Tenda	G3	-

Related Weaknesses (CWE)

CWE-120

References

https://hackmd.io/U7OVgYIuRcOKV7SW5-euHwExploitThird Party Advisory
https://hackmd.io/U7OVgYIuRcOKV7SW5-euHwExploitThird Party Advisory

FAQ

What is CVE-2021-27707?

CVE-2021-27707 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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/"portMappingIndex "request. This occurs because the...

How severe is CVE-2021-27707?

CVE-2021-27707 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-27707?

Check the references section above for vendor advisories and patch information. Affected products include: Tenda G1 Firmware, Tenda G1, Tenda G3 Firmware, Tenda G3.