Buffer Overflow Vulnerability in Tenda AC21 Router
CVE-2025-65220

4.3MEDIUM

Key Information:

Vendor

Tenda
Status
AC21 Router
Vendor
CVE Published:
20 November 2025

What is CVE-2025-65220?

The Tenda AC21 router has a Buffer Overflow vulnerability in its firmware, specifically located in the /goform/SetVirtualServerCfg function. This issue arises from the improper handling of the 'list' parameter, potentially allowing an attacker to execute arbitrary code or disrupt the device’s functionality. Proper validation and sanitization of inputs are crucial to mitigate this risk, emphasizing the need for users to maintain up-to-date firmware to protect their network security.

References

https://github.com/Madgeaaaaa/MY_VULN_2/blob/main/Tenda/V...

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-65220 : Buffer Overflow Vulnerability in Tenda AC21 Router