Heap-Based Buffer Overflow in Tenda AC19 Router
CVE-2026-123966

10CRITICAL

Key Information:

Vendor

Tenda
Status
Ac19
Vendor
CVE Published:
7 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-123966?

A vulnerability exists in the Tenda AC19 router, specifically in the function saveParentControlInfo located in the /goform/saveParentControlInfo file. This vulnerability arises from improper handling of the deviceId argument, leading to a potential heap-based buffer overflow. The issue allows for remote exploitation, posing significant risks to network security. The vulnerability has been publicly disclosed, making affected systems susceptible to exploitation.

Affected Version(s)

AC19 16.03.10.07

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-2026-123966 - Proof of Concept

References

https://vuldb.com/vuln/432038
vdb-entrytechnical-description
https://vuldb.com/vuln/432038/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-123966
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
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

tmzhou (VulDB User)
.