Stack-based Buffer Overflow in Tenda A18 Router
CVE-2026-2876

8.7HIGH

Key Information:

Vendor

Tenda
Status
A18
Vendor
CVE Published:
21 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2876?

A stack-based buffer overflow vulnerability exists in the Tenda A18 router, specifically in the 'parse_macfilter_rule' function of the '/goform/setBlackRule' file. This vulnerability can be exploited remotely by manipulating the 'deviceList' argument, leading to potential unauthorized access or command execution. The issue has been disclosed publicly, putting affected systems at risk if not adequately secured.

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Affected Version(s)

A18 15.13.07.13

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-2026-2876 - Proof of Concept

References

https://vuldb.com/?id.347114
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347114
signaturepermissions-required
https://vuldb.com/?submit.754675
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

junqi (VulDB User)
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