Buffer Overflow Vulnerability in Totolink X5000R Router
CVE-2026-8137

8.7HIGH

Key Information:

Vendor

Totolink
Status
X5000r
Vendor
CVE Published:
8 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8137?

A buffer overflow vulnerability exists in the Totolink X5000R router, specifically within the sub_458E40 function of the /boafrm/formDdns file. An attacker can manipulate the submit-url argument, which could lead to remote exploitation. This vulnerability has been publicly disclosed and poses significant risks due to its potential for allowing unauthorized access.

Affected Version(s)

X5000R 9.1.0u.6369_B20230113

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-2026-8137 - Proof of Concept

References

https://vuldb.com/vuln/361926
vdb-entrytechnical-description
https://vuldb.com/vuln/361926/cti
signaturepermissions-required
https://vuldb.com/submit/808863
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

kiciot (VulDB User)
.