Buffer Overflow Vulnerability in Tenda AC12 Web Management Interface
CVE-2026-19821

8.7HIGH

Key Information:

Vendor

Tenda
Status
Ac12
Vendor
CVE Published:
14 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19821?

A vulnerability exists in the Tenda AC12's web management interface within the formSetRebootTimer functionality located in the file /goform/SetSysAutoRebbotCfg. This flaw allows an attacker to manipulate the rebootTime argument, causing a buffer overflow that could enable remote exploitation. The vulnerability has been publicly disclosed, raising concerns about potential unauthorized access or control over the affected device.

Affected Version(s)

AC12 15.03.06.23_multi_TD01

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-2026-19821 - Proof of Concept

References

https://vuldb.com/vuln/389954
vdb-entrytechnical-description
https://vuldb.com/vuln/389954/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19821
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

stksgg (VulDB User)
.