What is the CVSS score of CVE-2026-3808?

CVE-2026-3808 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-2026-3808?

Yes, a public proof-of-concept exploit is available for CVE-2026-3808. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3808?

Within 24 hours: Identify all Tenda FH1202 1.2.0.14(408) devices in your environment and isolate them from critical networks if possible. Within 7 days: Implement network segmentation to restrict administrative access to affected devices, monitor for suspicious web requests to /goform/webtypelibrary, and evaluate device replacement or upgrade timelines. Within 30 days: Replace affected devices with patched firmware versions (when available from Tenda) or alternative vendors; conduct network forensics to identify potential compromise during the vulnerable window.

Fh1202 Firmware CVE-2026-3808

HIGH

Buffer Overflow (CWE-119)

2026-03-09 cna@vuldb.com

Buffer Overflow Stack Overflow Tenda Fh1202 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 FH1202 device
Delivery

Send malicious POST request to /goform/webtypelibrary
Exploit

Craft oversized webSiteId parameter
Execution

Trigger stack buffer overflow
Impact

Execute arbitrary code as root

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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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 FH1202 firmware version 1.2.0.14(408) with formWebTypeLibrary function accessible at /goform/webtypelibrary endpoint. Attacker requires valid login credentials to the device web interface (PR:L). Stack-based buffer overflow triggered via webSiteId parameter manipulation.
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 flaw, stack-based buffer overflow.

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

Stack-based buffer overflow in Tenda FH1202 firmware version 1.2.0.14(408) allows remote authenticated attackers to achieve full system compromise through manipulation of the webSiteId parameter in the /goform/webtypelibrary function. Public exploit code exists for this vulnerability, and no patch is currently available. The high CVSS score of 8.8 reflects the potential for complete confidentiality, integrity, and availability impact.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:56 CVSS 8.8

A vulnerability was detected in Tenda FH1202 1.2.0.14(408). The affected element is the function formWebTypeLibrary of the file /goform/webtypelibrary. [CVSS 8.8 HIGH]

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 Fh1202 Firmware. A vulnerability was detected in Tenda FH1202 1.2.0.14(408). The affected element is the function formWebTypeLibrary of the file /goform/webtypelibrary. Performing a manipulation of the argument webSiteId results in stack-based buffer overflow. The attack may be initiated remotely. The exploit is now public 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

Mar 09, 2026 - 15:30 vuln.today

Public exploit code

CVE Published

Mar 09, 2026 - 08:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was detected in Tenda FH1202 1.2.0.14(408). The affected element is the function formWebTypeLibrary of the file /goform/webtypelibrary. Performing a manipulation of the argument webSiteId results in stack-based buffer overflow. The attack may be initiated remotely. The exploit is now public and may be used.

Executive ViewAI

Why It Matters

A critical vulnerability in Tenda FH1202 wireless routers (CVE-2026-3808) allows attackers to execute unauthorized actions through a web interface function, with public exploit code now available. Organizations using this device model are at immediate risk of network compromise, unauthorized access, and potential lateral movement into connected systems.

Business Impact: High

Compensating Controls

Implement WAF rules blocking POST/GET requests to /goform/webtypelibrary endpoint; restrict administrative web interface access via firewall rules to trusted IP ranges only; disable remote management features on affected devices; segment router management traffic on dedicated VLAN; enable detailed logging on network perimeter devices; monitor for exploitation attempts; consider replacing with alternative vendor devices if patch timeline is uncertain.

Threat Intelligence Overview

EPSS Score

0.1%

Top 75% 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.

Stack-based Buffer Overflow HIGH

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.