Stack-Based Buffer Overflow in Tenda AC21 and AC23 Routers
CVE-2025-9605

9.3CRITICAL

Key Information:

Vendor

Tenda
Status
Ac21
Ac23
Vendor
CVE Published:
29 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-9605?

A stack-based buffer overflow vulnerability exists in the Tenda AC21 and AC23 routers due to improper handling of the 'mac' argument in the GetParentControlInfo function. This vulnerability allows remote attackers to potentially exploit the device, leading to unauthorized access and control. Users are advised to update their devices to the latest firmware to safeguard against any potential attacks.

Affected Version(s)

AC21 16.03.08.16

AC23 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-2025-9605 - Proof of Concept

References

https://vuldb.com/?id.321783
vdb-entrytechnical-description
https://vuldb.com/?ctiid.321783
signaturepermissions-required
https://vuldb.com/?submit.636545
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
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

lxyilu (VulDB User)
.
CVE-2025-9605 : Stack-Based Buffer Overflow in Tenda AC21 and AC23 Routers