What is the CVSS score of CVE-2026-3400?

CVE-2026-3400 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-2026-3400?

Yes, a public proof-of-concept exploit is available for CVE-2026-3400. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3400?

Within 24 hours: Inventory all Tenda AC15 devices running firmware 15.13.07.13 or earlier and isolate critical systems from affected routers. Within 7 days: Implement network segmentation to limit lateral movement from compromised devices and enable enhanced monitoring on affected equipment. Within 30 days: Replace vulnerable Tenda AC15 routers with patched versions or alternative vendors, or apply vendor patches immediately upon availability.

Ac15 Firmware CVE-2026-3400

HIGH

Buffer Overflow (CWE-119)

2026-03-02 cna@vuldb.com

Buffer Overflow Stack Overflow Tenda Ac15 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 AC15 web interface
Delivery

Send POST request to /goform/TextEditingConversion
Exploit

Inject oversized wpapsk_crypto2_4g parameter
Execution

Trigger stack buffer overflow
Impact

Execute arbitrary code

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Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution,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 AC15 firmware version 15.13.07.13 or earlier with web interface accessible. Requires valid login credentials to access /goform/TextEditingConversion endpoint. Attack targets wpapsk_crypto2_4g parameter in TextEditingConversion functionality.
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)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 12, 2026

Remote code execution in Tenda AC15 firmware versions up to 15.13.07.13 via a stack-based buffer overflow in the /goform/TextEditingConversion endpoint allows unauthenticated attackers to achieve complete system compromise. Public exploit code exists for this vulnerability, and no patch is currently available, creating immediate risk for deployed devices. An attacker can exploit this remotely with minimal complexity by manipulating the wpapsk_crypto2_4g parameter.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.8

A security flaw has been discovered in Tenda AC15 up to 15.13.07.13. Affected by this issue is some unknown functionality of the file /goform/TextEditingConversion. [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 Ac15 Firmware. A security flaw has been discovered in Tenda AC15 up to 15.13.07.13. Affected by this issue is some unknown functionality of the file /goform/TextEditingConversion. The manipulation of the argument wpapsk_crypto2_4g results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.

Know when Ac15 Firmware gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

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 03, 2026 - 19:48 vuln.today

Public exploit code

CVE Published

Mar 02, 2026 - 00:16 nvd

HIGH 8.8

DescriptionCVE.org

A security flaw has been discovered in Tenda AC15 up to 15.13.07.13. Affected by this issue is some unknown functionality of the file /goform/TextEditingConversion. The manipulation of the argument wpapsk_crypto2_4g results in stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.

Executive ViewAI

Why It Matters

A critical vulnerability affecting Tenda AC15 routers (CVE-2026-3400, CVSS 8.8) poses significant risk to organizations using this networking equipment. With public exploits available and no patch currently available, attackers could potentially gain unauthorized access to affected devices, compromising network security and data confidentiality.

Business Impact: High

Compensating Controls

Disable or restrict access to the /goform/TextEditingConversion endpoint via firewall rules and WAF policies if the feature is non-essential. Implement network segmentation to isolate affected routers from critical systems. Enable enhanced logging and monitoring for suspicious activity on these devices. Restrict administrative access to affected routers to authorized personnel only. Consider temporary replacement with alternative networking equipment until patches are available.

Threat Intelligence Overview

EPSS Score

0.1%

Top 69% 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.

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.