Buffer Overflow Vulnerability in Totolink A800R Router
CVE-2026-6157

8.7HIGH

Key Information:

Vendor

Totolink
Status
A800r
Vendor
CVE Published:
13 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6157?

A buffer overflow vulnerability has been identified in the Totolink A800R router, specifically within the setAppEasyWizardConfig function of the app.so library. The flaw arises from improper handling of the apcliSsid argument, allowing attackers to execute remote exploits that may compromise the device's functionality. Given that this threat is now public, users are urged to apply necessary security measures immediately.

Affected Version(s)

A800R 4.1.2cu.5137_B20200730

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-2026-6157 - Proof of Concept

References

https://vuldb.com/vuln/357037
vdb-entrytechnical-description
https://vuldb.com/vuln/357037/cti
signaturepermissions-required
https://vuldb.com/submit/793114
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

xuanyu (VulDB User)
.