Command Injection Flaw in Totolink A8000RU Router
CVE-2026-7823

9.3CRITICAL

Key Information:

Vendor

Totolink
Status
A8000ru
Vendor
CVE Published:
5 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-7823?

A security flaw has been identified in the Totolink A8000RU router, specifically within the setAppFilterCfg function in cgi-bin/cstecgi.cgi. This vulnerability allows for remote command injection via manipulation of the 'enable' argument. An attacker can exploit this flaw to execute arbitrary commands on the affected device, potentially compromising system integrity and confidentiality. The exploit is publicly available, increasing the urgency for users to secure their devices and apply any available patches.

Affected Version(s)

A8000RU 7.1cu.643_b20200521

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-2026-7823 - Proof of Concept

References

https://vuldb.com/vuln/361075
vdb-entrytechnical-description
https://vuldb.com/vuln/361075/cti
signaturepermissions-required
https://vuldb.com/submit/807775
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

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LtzHust2 (VulDB User)
.