What is the CVSS score of CVE-2026-3271?

CVE-2026-3271 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-2026-3271?

Yes, a public proof-of-concept exploit is available for CVE-2026-3271. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3271?

Within 24 hours: Inventory all Tenda F453 devices in production and isolate affected units from critical network segments. Within 7 days: Implement network-level compensating controls including WAF rules blocking /goform/P2pListFilter requests and restrict httpd access to trusted networks only. Within 30 days: Develop a replacement plan for affected Tenda devices with alternative vendors, as the vulnerability remains unpatched.

F453 Firmware CVE-2026-3271

HIGH

Buffer Overflow (CWE-119)

2026-02-27 cna@vuldb.com

Buffer Overflow Tenda F453 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 F453 httpd
Delivery

Send crafted request to /goform/P2pListFilter
Exploit

Inject oversized 'page' parameter
Execution

Trigger stack buffer overflow
Impact

Execute arbitrary code with httpd 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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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 F453 firmware version 1.0.0.3 with httpd service enabled; valid user credentials required for authentication to access /goform/P2pListFilter endpoint
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

Remote code execution in Tenda F453 firmware through a buffer overflow in the P2pListFilter HTTP handler allows authenticated attackers to achieve complete system compromise. Public exploit code exists for this vulnerability, creating immediate risk for deployed devices. No patch is currently available, leaving affected systems vulnerable to exploitation.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.8

A vulnerability was found in Tenda F453 1.0.0.3. This impacts the function fromP2pListFilter of the file /goform/P2pListFilterof of the component httpd. [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 F453 Firmware. A vulnerability was found in Tenda F453 1.0.0.3. This impacts the function fromP2pListFilter of the file /goform/P2pListFilterof of the component httpd. The manipulation of the argument page results in buffer overflow. The attack may be launched remotely. The exploit has been made public and could 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 27, 2026 - 18:30 vuln.today

Public exploit code

CVE Published

Feb 27, 2026 - 00:16 nvd

HIGH 8.8

DescriptionCVE.org

A vulnerability was found in Tenda F453 1.0.0.3. This impacts the function fromP2pListFilter of the file /goform/P2pListFilterof of the component httpd. The manipulation of the argument page results in buffer overflow. The attack may be launched remotely. The exploit has been made public and could be used.

Executive ViewAI

Why It Matters

A high-severity remote code execution vulnerability affects Tenda F453 routers with no available patch, exposing organizations using this equipment to potential unauthorized access and network compromise. This vulnerability poses an immediate risk to network infrastructure security and requires urgent mitigation to prevent exploitation.

Business Impact: High

Compensating Controls

Implement Web Application Firewall rules to block access to /goform/P2pListFilter endpoint; restrict httpd service access via network segmentation and firewall policies; disable P2P filtering feature if functionality is not critical; monitor for exploitation attempts; consider replacing affected Tenda F453 devices with alternative network equipment from vendors providing security patches.

Threat Intelligence Overview

EPSS Score

0.1%

Top 69% 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.