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%.

Which versions of Ac8 Firmware are affected by CVE-2026-2203?

Tenda AC8 routers (version 16.03.33.05) contain a high-severity vulnerability allowing remote attackers to compromise WiFi settings without authentication.

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 Ac8 Firmware

8.8

CVSS 3.1 · NVD

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

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.

AnalysisAI

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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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

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 AssessmentAI

Exploitation	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. Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	A remote attacker could exploit this vulnerability to compromise the affected system.
Remediation	Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all Tenda AC8 devices in production and isolate affected units from critical network segments. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-2203 vulnerability details – vuln.today

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Ac8 Firmware CVE-2026-2203

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

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External POC / Exploit Code