What is the CVSS score of CVE-2026-2203?

CVE-2026-2203 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-2203?

Yes, a public proof-of-concept exploit is available for CVE-2026-2203. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2203?

Within 24 hours: Inventory all Tenda AC8 devices in production and isolate affected units from critical network segments. Within 7 days: Contact Tenda for patch availability and ETA; implement network access controls limiting administrative access to the embedded web service. Within 30 days: Deploy patches immediately upon release or replace affected devices with patched firmware versions.

Ac8 Firmware CVE-2026-2203

HIGH

Buffer Overflow (CWE-119)

2026-02-09 cna@vuldb.com

Buffer Overflow Tenda Ac8 Firmware

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Authenticate to Tenda AC8 web interface
Delivery

Send crafted HTTP request to /goform/fast_setting_wifi_set
Exploit

Inject oversized timeZone parameter
Execution

Trigger buffer overflow in Embedded Httpd
Impact

Execute arbitrary code on router

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Tenda AC8 firmware version 16.03.33.05; requires valid login credentials to access /goform/fast_setting_wifi_set endpoint on Embedded Httpd Service; standard HTTP web interface must be enabled.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to compromise the affected system.

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 12, 2026

Buffer overflow in Tenda AC8 firmware version 16.03.33.05 allows authenticated remote attackers to execute arbitrary code via the timeZone parameter in the /goform/fast_setting_wifi_set endpoint. Public exploit code exists for this vulnerability, and no patch is currently available. The high CVSS score of 8.8 reflects the ability to achieve complete system compromise through network access.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:54 CVSS 8.8

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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

Technical ContextAI · show details

Classified as CWE-119 (Buffer Overflow). Affects Ac8 Firmware. A flaw has been found in Tenda AC8 16.03.33.05. Affected by this vulnerability is an unknown functionality of the file /goform/fast_setting_wifi_set of the component Embedded Httpd Service. This manipulation of the argument timeZone causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Feb 10, 2026 - 15:07 vuln.today

Public exploit code

CVE Published

Feb 09, 2026 - 03:16 nvd

HIGH 8.8

DescriptionCVE.org

A flaw has been found in Tenda AC8 16.03.33.05. Affected by this vulnerability is an unknown functionality of the file /goform/fast_setting_wifi_set of the component Embedded Httpd Service. This manipulation of the argument timeZone causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.

Executive ViewAI

Why It Matters

Tenda AC8 routers (version 16.03.33.05) contain a high-severity vulnerability allowing remote attackers to compromise WiFi settings without authentication. Organizations using these devices face potential network takeover, unauthorized access, and data exfiltration, with active exploits already in the wild.

Business Impact: High

Compensating Controls

Disable remote management of the embedded Httpd service; restrict network access to /goform/fast_setting_wifi_set via firewall rules; implement WAF rules blocking requests to this endpoint; segment Tenda devices on isolated VLANs with restricted egress; disable the web-based administration interface if management can be performed out-of-band; monitor for suspicious configuration changes to WiFi settings.

Threat Intelligence Overview

EPSS Score

0.1%

Top 76% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

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

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

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

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.