Which versions of Totolink A8000RU are affected by EUVD-2026-25839?

Totolik A8000RU routers running firmware 7.1cu.643_b20200521 are vulnerable to unauthenticated remote command execution via a web interface parameter, allowing attackers to take complete control of…

Is there a public PoC exploit available for EUVD-2026-25839?

Yes, a public proof-of-concept exploit is available for EUVD-2026-25839. Prioritise patching immediately. EPSS: 0.9%.

How to fix or mitigate EUVD-2026-25839?

Within 24 hours: Identify and inventory all Totolink A8000RU devices running firmware 7.1cu.643_b20200521 in your environment using network scanning or management platforms. Within 7 days: Implement network segmentation to isolate affected routers from sensitive systems and restrict internet access to firmware download and update servers only. Within 30 days: Replace affected devices with modern alternatives from vendors with active security support, or decommission the hardware if replacement is not immediately feasible.

Totolink A8000RU EUVD-2026-25839

Q: What is the CVSS score of EUVD-2026-25839?

EUVD-2026-25839 has a CVSS 4.0 base score of 8.9 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.9%.

| CVE-2026-7123 HIGH

OS Command Injection (CWE-78)

2026-04-27 VulDB

Command Injection A8000Ru

8.9

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

8.9 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

Apr 27, 2026 - 18:37 vuln.today

cvss_changed

PoC Detected

Apr 27, 2026 - 18:36 vuln.today

Public exploit code

Analysis Generated

Apr 27, 2026 - 13:30 vuln.today

Severity Changed

Apr 27, 2026 - 13:22 NVD

CRITICAL HIGH

CVSS changed

Apr 27, 2026 - 13:22 NVD

9.8 (CRITICAL) 8.9 (HIGH)

EUVD ID Assigned

Apr 27, 2026 - 13:00 euvd

EUVD-2026-25839

Analysis Generated

Apr 27, 2026 - 13:00 vuln.today

CVE Published

Apr 27, 2026 - 12:15 nvd

HIGH 8.9

DescriptionCVE.org

A vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function setIptvCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. Performing a manipulation of the argument setIptvCfg results in os command injection. The attack can be initiated remotely. The exploit has been made public and could be used.

AnalysisAI

OS command injection in Totolink A8000RU router firmware 7.1cu.643_b20200521 allows remote unauthenticated attackers to execute arbitrary system commands via the setIptvCfg parameter in /cgi-bin/cstecgi.cgi. CVSS 8.9 (Critical) with network attack vector and no authentication required. Public exploit code available on GitHub since disclosure, significantly lowering exploitation barrier for attackers targeting internet-facing consumer routers. No vendor patch identified for this end-of-life device at time of analysis.

Technical ContextAI

This vulnerability affects the CGI-based web management interface of Totolink A8000RU wireless router, specifically the setIptvCfg function within the /cgi-bin/cstecgi.cgi handler used for IPTV configuration. The root cause is CWE-78 (OS Command Injection), where user-supplied input to the setIptvCfg argument is passed unsanitized to system shell commands. CGI scripts in embedded router firmware frequently suffer from inadequate input validation because they execute with elevated privileges and directly interact with system commands for device configuration. The affected product runs a Linux-based embedded operating system typical of consumer routers, where command injection in web interfaces often leads to full device compromise since web services run as root or with equivalent privileges.

RemediationAI

No vendor-released patch identified at time of analysis for Totolink A8000RU firmware 7.1cu.643_b20200521. Check Totolink vendor site (https://www.totolink.net/) for firmware updates newer than the May 2020 build, though device appears end-of-life. If no patch available, implement network-level compensating controls immediately: (1) Disable remote management access by configuring the router to block WAN-side access to administrative interfaces on TCP ports 80 and 443, accepting the trade-off of local-only administration; (2) Place the router behind a perimeter firewall and restrict management access to specific trusted IP addresses via ACLs, which may complicate remote support scenarios; (3) If IPTV functionality (the attack surface for setIptvCfg) is not required for your deployment, disable it entirely in the router configuration to eliminate this attack vector, noting this breaks IPTV services. For environments where these mitigations are insufficient, hardware replacement with actively supported router firmware (from vendors with established security update programs) is recommended given the device's apparent end-of-life status and critical severity of unauthenticated RCE.