Stack-Based Buffer Overflow in Tenda A21 Routers
CVE-2026-2872

8.7HIGH

Key Information:

Vendor

Tenda
Status
A21
Vendor
CVE Published:
21 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2872?

A security vulnerability has been identified in Tenda A21 firmware version 1.0.0.0, specifically within the /goform/setBlackRule endpoint of the MAC Filtering Configuration feature. This vulnerability arises from inadequate validation of the input parameter 'devName/mac', which may result in a stack-based buffer overflow. Threat actors can exploit this flaw remotely, allowing unauthorized access or control over the device. The exploit has been publicly disclosed, necessitating immediate action to mitigate potential risks associated with this vulnerability.

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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-2026-2872 - Proof of Concept

References

https://vuldb.com/?id.347109
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347109
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https://vuldb.com/?submit.754634
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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