Buffer Overflow Vulnerability in Tenda AC21 Router
CVE-2025-10838

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac21
Vendor
CVE Published:
23 September 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-10838?

A buffer overflow vulnerability has been identified in the Tenda AC21 router, specifically in the function sub_45BB10 of the /goform/WifiExtraSet file. This flaw resides in the argument wpapsk_crypto, which can be manipulated to execute a successful attack. Attackers can exploit this vulnerability remotely, and there are known public exploits available, making devices running the affected version susceptible to unauthorized access or control.

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Affected Version(s)

AC21 16.03.08.16

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-10838 - Proof of Concept

References

https://vuldb.com/?id.325200
vdb-entrytechnical-description
https://vuldb.com/?ctiid.325200
signaturepermissions-required
https://vuldb.com/?submit.657126
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

QMSSDXN (VulDB User)
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