Stack-based Buffer Overflow in Tenda A21 by Tenda
CVE-2026-2886

8.7HIGH

Key Information:

Vendor

Tenda
Status
A21
Vendor
CVE Published:
21 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2886?

A stack-based buffer overflow vulnerability has been discovered in the Tenda A21 router, specifically within the set_device_name function located at /goform/SetOnlineDevName. By manipulating the input parameter devName, an attacker can exploit this weakness remotely, potentially leading to arbitrary code execution. Publicly available exploitation techniques increase the risk of attacks targeting affected devices. Users of the Tenda A21 1.0.0.0 should apply appropriate security measures to mitigate potential threats.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

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-2026-2886 - Proof of Concept

References

https://vuldb.com/?id.347180
vdb-entrytechnical-description
https://vuldb.com/?ctiid.347180
signaturepermissions-required
https://vuldb.com/?submit.754640
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)
JSON
.