What is the CVSS score of CVE-2026-2911?

CVE-2026-2911 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-2026-2911?

Yes, a public proof-of-concept exploit is available for CVE-2026-2911. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-2911?

Within 24 hours: Inventory all Tenda FH451 devices in production and assess network exposure; isolate or restrict access to affected devices if possible. Within 7 days: Contact Tenda for patch availability and timeline; implement network segmentation to limit device accessibility. Within 30 days: Deploy patches immediately upon availability, or plan device replacement if no patch is released; conduct network assessment for signs of compromise.

Fh451 Firmware CVE-2026-2911

HIGH

Buffer Overflow (CWE-119)

2026-02-22 cna@vuldb.com

Buffer Overflow Tenda Fh451 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 FH451 web interface
Exploit

Send oversized payload to /goform/GstDhcpSetSer
Execution

Trigger buffer overflow in DHCP handler
Impact

Execute arbitrary code with device privileges

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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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 FH451 firmware version 1.0.0.9 or earlier with web management interface accessible; attacker must possess valid login credentials for the router's admin panel
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, 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

Buffer overflow in Tenda FH451 firmware versions up to 1.0.0.9 allows authenticated remote attackers to achieve code execution through crafted requests to the /goform/GstDhcpSetSer endpoint. Public exploit code exists for this vulnerability, and no patch is currently available, leaving all affected devices at risk.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:04 CVSS 8.8

A vulnerability has been found in Tenda FH451 up to 1.0.0.9. This issue affects some unknown processing of the file /goform/GstDhcpSetSer. [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 Fh451 Firmware. A vulnerability has been found in Tenda FH451 up to 1.0.0.9. This issue affects some unknown processing of the file /goform/GstDhcpSetSer. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the 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

Feb 23, 2026 - 20:21 vuln.today

Public exploit code

CVE Published

Feb 22, 2026 - 04:15 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability has been found in Tenda FH451 up to 1.0.0.9. This issue affects some unknown processing of the file /goform/GstDhcpSetSer. The manipulation leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.

Executive ViewAI

Why It Matters

A high-severity vulnerability (CVE-2026-2911) affects Tenda FH451 routers up to version 1.0.0.9 with an active public exploit available. Organizations using this device model face immediate risk of unauthorized access or system compromise, particularly if devices are internet-facing or accessible to untrusted networks.

Business Impact: High

Compensating Controls

Implement WAF rules to block access to /goform/GstDhcpSetSer endpoint; restrict network access to the device via firewall ACLs limiting exposure to trusted networks only; disable DHCP configuration features if not operationally required; segment affected routers on isolated VLANs; monitor for suspicious access attempts to the vulnerable endpoint; consider temporary device replacement with patched alternatives while awaiting vendor patch.

Threat Intelligence Overview

EPSS Score

0.1%

Top 77% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

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.