Which versions of TOTOLINK A8000RU are affected by EUVD-2026-31674?

TOTOLIK A8000RU routers running firmware 7.1cu.643_b20200521 are remotely exploitable by unauthenticated attackers through command injection in the management interface, enabling complete device…

Is there a public PoC exploit available for EUVD-2026-31674?

Yes, a public proof-of-concept exploit is available for EUVD-2026-31674. Prioritise patching immediately. EPSS: 0.9%.

How to fix or mitigate EUVD-2026-31674?

Within 24 hours: Identify and inventory all TOTOLIK A8000RU routers; determine WAN accessibility of management interfaces. Within 7 days: Implement firewall rules blocking inbound WAN access to router management HTTP/HTTPS services and isolate affected devices on restricted network segments. Within 30 days: Contact TOTOLIK for patched firmware availability and deploy immediately upon release; if no patch timeline emerges, evaluate replacement with alternative vendor products.

TOTOLINK A8000RU EUVD-2026-31674

Q: What is the CVSS score of EUVD-2026-31674?

EUVD-2026-31674 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-2026-9456 HIGH

OS Command Injection (CWE-78)

2026-05-25 VulDB

GHSA-x66f-p4rh-4mgx

Command Injection A8000Ru

8.9

CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) 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 Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

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

Analysis Generated

Jun 08, 2026 - 09:41 vuln.today

Severity Changed

May 26, 2026 - 19:07 NVD

CRITICAL HIGH

CVSS changed

May 26, 2026 - 19:07 NVD

9.8 (CRITICAL) 8.9 (HIGH)

CVE Published

May 25, 2026 - 12:00 nvd

HIGH 8.9

DescriptionCVE.org

A vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521. Impacted is the function setOpenVpnCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. The manipulation of the argument enabled results in os command injection. The attack can be executed remotely. The exploit has been made public and could be used.

AnalysisAI

Remote OS command injection in TOTOLINK A8000RU router firmware 7.1cu.643_b20200521 allows unauthenticated attackers to execute arbitrary commands via the setOpenVpnCfg function in /cgi-bin/cstecgi.cgi by manipulating the 'enabled' argument. Publicly available exploit code exists, raising the risk of opportunistic attacks against exposed devices, though EPSS scoring (0.89%, 76th percentile) suggests moderate but not yet widespread exploitation. The flaw stems from improper neutralization of OS command elements (CWE-78) in the router's Web Management Interface.

Technical ContextAI

The TOTOLINK A8000RU is a consumer/SOHO wireless router. The vulnerability resides in /cgi-bin/cstecgi.cgi, the central CGI handler used by the router's Web Management Interface to dispatch configuration changes. The setOpenVpnCfg function processes OpenVPN client/server configuration parameters, and the 'enabled' argument is passed into a shell context without proper sanitization - a classic CWE-78 (Improper Neutralization of Special Elements used in an OS Command) pattern common in embedded MIPS/ARM router firmware where CGI handlers invoke system() or popen() on user-controlled input. The affected CPE (cpe:2.3:a:totolink:a8000ru:*) confirms the A8000RU product line as the impacted device.

RemediationAI

No vendor-released patch identified at time of analysis - TOTOLINK has not published an advisory or fixed firmware version in the available references. As compensating controls, administrators should immediately disable WAN-side access to the Web Management Interface (this is typically the default and prevents internet-based exploitation but does not stop LAN-side attackers), restrict access to /cgi-bin/cstecgi.cgi through router firewall rules or an upstream segmentation device (side effect: legitimate remote management workflows will break), and consider replacing the device if it has reached end-of-life with no forthcoming patch (side effect: hardware replacement cost). Monitor https://www.totolink.net/ and the VulDB entry at https://vuldb.com/vuln/365437 for firmware updates, and refer to the public exploit details at https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_344/README.md for detection signatures.