Buffer Overflow Vulnerability in Totolink NR1800X Router
CVE-2026-7546

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
Nr1800x
Vendor
CVE Published:
1 May 2026

Badges

πŸ‘Ύ Exploit Exists🟑 Public PoC

What is CVE-2026-7546?

A vulnerability affecting Totolink NR1800X routers has been identified in the find_host_ip function of the lighttpd component. This issue can lead to a stack-based buffer overflow due to improper handling of the Host argument. The vulnerability allows for remote exploitation, posing a significant risk to network security. Attackers may leverage this flaw to execute malicious code, potentially compromising the device's integrity and user data. Prompt action is recommended to mitigate this threat.

Affected Version(s)

NR1800X 9.1.0u.6279_B20210910

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-2026-7546 - Proof of Concept

References

https://vuldb.com/vuln/360357
vdb-entrytechnical-description
https://vuldb.com/vuln/360357/cti
signaturepermissions-required
https://vuldb.com/submit/804404
third-party-advisory

CVSS V4

Score:
9.3
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

  • πŸ‘Ύ

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

NEWYM (VulDB User)
.