Stack-Based Buffer Overflow in Tenda A21 by Tenda
CVE-2026-2871

8.7HIGH

Key Information:

Vendor

Tenda
Status
A21
Vendor
CVE Published:
21 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2871?

A stack-based buffer overflow vulnerability has been identified in the Tenda A21 model 1.0.0.0, specifically in the fromSetIpMacBind function within the /goform/SetIpMacBind file. This weakness allows remote attackers to manipulate the argument list, potentially leading to unauthorized access and control over the device. Exploits for this vulnerability have already been made publicly available, positioning affected users at risk of compromise. It is recommended that users review their device configurations and consider applying necessary patches or mitigations as soon as possible.

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Affected Version(s)

A21 1.0.0.0

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-2026-2871 - Proof of Concept

References

https://vuldb.com/?id.347108
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347108
signaturepermissions-required
https://vuldb.com/?submit.754631
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

hhsw34 (VulDB User)
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