Buffer Overflow Vulnerability in Tenda AC20 Router
CVE-2025-8810

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac20
Vendor
CVE Published:
10 August 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-8810?

A vulnerability exists in the Tenda AC20 router, specifically in the function strcpy located in the /goform/SetFirewallCfg file. This vulnerability can be exploited through a remote attack by manipulating the firewallEn argument, leading to a stack-based buffer overflow. The exploit has been publicly disclosed, presenting significant risks to unsecured devices.

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Affected Version(s)

AC20 16.03.08.05

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-2025-8810 - Proof of Concept

References

https://vuldb.com/?id.319339
vdb-entrytechnical-description
https://vuldb.com/?ctiid.319339
signaturepermissions-required
https://vuldb.com/?submit.627394
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

hundun (VulDB User)
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