What is the CVSS score of EUVD-2026-12470?

EUVD-2026-12470 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. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for EUVD-2026-12470?

Yes, a public proof-of-concept exploit is available for EUVD-2026-12470. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate EUVD-2026-12470?

Within 24 hours: Identify and inventory all Tenda AC8 16.03.50.11 devices in production and isolate them from critical network segments; disable remote management if enabled. Within 7 days: Implement network segmentation to restrict access to affected devices, enable logging/monitoring for suspicious IPv6 activity, and contact Tenda for patch timeline. Within 30 days: Plan device replacement or upgrade to patched firmware version as soon as available; consider deploying alternative router hardware if Tenda does not provide timely patching.

Tenda EUVD-2026-12470

| CVE-2026-4252 HIGH

Reliance on IP Address for Authentication (CWE-291)

2026-03-16 VulDB

Information Disclosure Tenda

8.9

CVSS 4.0 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Craft IPv6 packet with spoofed source address
Exploit

Bypass check_is_ipv6 authentication logic
Impact

Gain unauthorized access to router

Vulnerability Assessment

Weakness	CWE CWE-291 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication IP-independent authentication
Exploitation Conditions	Tenda AC8 firmware version 16.03.50.11 with IPv6 Handler enabled. No authentication required — remote unauthenticated exploitation against default Tenda AC8 configurations.
Impact	This vulnerability presents an extremely high real-world risk based on multiple factors: the CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) indicates remote exploitation with low complexity, no privileges required, and no user interaction needed, resulting in complete compromise of confidentiality, integrity, and availability. The exploit code indicator (E:P) confirms a public proof-of-concept exists, specifically available on GitHub. The workaround indicator (RL:W) suggests only workarounds are available with no patch released. While EPSS data is not provided and it's not in CISA KEV, the combination of a working public exploit, network-accessible attack vector, and no authentication requirement makes this a critical priority for any organization using these routers.
Exploit ScenarioDerived	An attacker can remotely exploit this vulnerability by crafting requests that bypass the IPv6 authentication check, gaining unauthorized administrative access to the Tenda AC8 router without any credentials. A working proof-of-concept exploit is publicly available at https://github.com/digitalandrew/tenda_ac8_v5/blob/main/poc_ipv6_auth_bypass.py, making exploitation trivial for even low-skilled attackers. Once compromised, the attacker gains full control over the router, potentially intercepting traffic, modifying DNS settings, or using the device as a pivot point for further network attacks.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

A critical authentication bypass vulnerability exists in Tenda AC8 router firmware version 16.03.50.11 where the IPv6 handler function check_is_ipv6 relies on IP address for authentication, allowing remote attackers to gain unauthorized access. The vulnerability has a publicly available proof-of-concept exploit on GitHub and scores 9.8 CVSS, enabling complete compromise of the affected device with no authentication required. While not currently listed in CISA KEV, the combination of public exploit availability and ease of exploitation makes this a high-priority vulnerability for organizations using affected Tenda routers.

RemediationAI

No official patch is currently available from Tenda for this vulnerability based on the provided references and the RL:W (workaround) indicator in the CVSS vector. Until a patch is released, organizations should implement network segmentation to isolate affected Tenda AC8 routers, disable IPv6 functionality if not required, implement strict firewall rules to limit remote access to the device management interface, and consider replacing the affected devices with alternatives that have proper authentication mechanisms. Monitor the vendor's security page at https://www.tenda.com.cn/ for future updates and patches.

Affected VersionsENISA

AC8 16.03.50.11

Affected Packages

euvd ac8 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerability affects the Tenda AC8 router firmware specifically in the IPv6 handling component, where the check_is_ipv6 function improperly relies on IP addresses for authentication decisions. According to the CPE identifier cpe:2.3:a:tenda:ac8:*:*:*:*:*:*:*:*, all versions of the AC8 firmware appear to be affected, though the specific vulnerable version confirmed is 16.03.50.11. The root cause is CWE-291 (Reliance on IP Address for Authentication), a fundamental security flaw where IP addresses are used as the sole factor for authentication, which can be easily spoofed or manipulated by attackers on the network.

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Exploit and PoC references, threat intelligence from 22 sources

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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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

PoC Detected

Apr 03, 2026 - 19:39 vuln.today

Public exploit code

CVE Published

Mar 16, 2026 - 16:32 nvd

HIGH 8.9

DescriptionCVE.org

A vulnerability was identified in Tenda AC8 16.03.50.11. Affected by this issue is the function check_is_ipv6 of the component IPv6 Handler. The manipulation leads to reliance on ip address for authentication. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.

Executive ViewAI

Why It Matters

A critical vulnerability in Tenda AC8 routers allows remote attackers to bypass authentication by spoofing IPv6 addresses, potentially giving unauthorized access to network infrastructure. With a public exploit available and no patch currently deployed, any organization using this device faces immediate risk of unauthorized network access and potential data breach or lateral movement attacks.

Business Impact: Severe

Compensating Controls

Disable IPv6 on affected devices if operationally feasible; 2) Implement network segmentation isolating affected routers from sensitive systems; 3) Deploy WAF/IDS rules to detect and block IPv6 spoofing attempts; 4) Restrict management access to affected devices to trusted internal networks only; 5) Increase logging and real-time alerting on authentication failures; 6) Consider temporary replacement with patched router models pending vendor patch availability.

Threat Intelligence Overview

EPSS Score

0.1%

Top 67% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.