Stack-Based Buffer Overflow in Tenda AC9 Router
CVE-2026-2191

8.6HIGH

Key Information:

Vendor

Tenda
Status
Ac9
Vendor
CVE Published:
8 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2191?

A vulnerability in the Tenda AC9 router has been identified, specifically in the function formGetDdosDefenceList. This flaw allows for the manipulation of the argument security.ddos.map, leading to a stack-based buffer overflow. This weakness can be exploited remotely, presenting significant security risks. Publicly available exploits make the situation even more concerning, emphasizing the importance of timely security measures for affected users.

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Affected Version(s)

AC9 15.03.06.42_multi

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-2026-2191 - Proof of Concept

References

https://vuldb.com/?id.344894
vdb-entrytechnical-description
https://vuldb.com/?ctiid.344894
signaturepermissions-required
https://vuldb.com/?submit.749800
third-party-advisory

CVSS V4

Score:
8.6
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

jfkk (VulDB User)
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