What is the CVSS score of CVE-2026-6015?

CVE-2026-6015 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-6015?

Yes, a public proof-of-concept exploit is available for CVE-2026-6015. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-6015?

Within 24 hours: Identify all Tenda AC9 devices in your network using firmware 15.03.02.13 and document inventory. Within 7 days: Contact Tenda for patch availability and timeline; isolate affected routers to a segregated management network or disable remote access if operationally feasible. Within 30 days: Implement network segmentation to restrict access to router administration interfaces, enforce strong authentication policies for router accounts, and monitor for suspicious administrative activity; replace affected devices if patch remains unavailable after 30 days.

Ac9 CVE-2026-6015

EUVD-2026-21311 HIGH

Stack-based Buffer Overflow (CWE-121)

2026-04-10 VulDB

GHSA-9jxj-33wq-5v9p

Buffer Overflow Stack Overflow Tenda Ac9

7.4

CVSS 4.0 · Vendor: VulDB

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate to Tenda AC9 web interface
Delivery

Send POST request to /goform/QuickIndex
Exploit

Inject oversized PPPOEPassword parameter
Execution

Trigger stack-based buffer overflow
Impact

Execute arbitrary code on router

Vulnerability Assessment

Weakness	CWE CWE-121 ASVS 5.0 V15 - Secure Coding and Architecture Stack buffer bounds checking MITRE ATT&CK 1 technique across 1 tactic: Execution 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	Requires authenticated access to Tenda AC9 router (version 15.03.02.13). Attacker must send a crafted POST request to /goform/QuickIndex with oversized PPPOEPassword parameter to trigger stack-based buffer overflow. Authentication credentials needed; no user interaction required.
Impact	Critical priority despite lack of KEV confirmation. Unauthenticated remote stack overflow with high impact (confidentiality, integrity, availability). CVSS 8.8 reflects network accessibility and low complexity. Publicly available exploit code significantly lowers barrier to weaponization. Tenda router installed base warrants immediate patching.
Exploit ScenarioDerived	Attacker sends crafted POST request to /goform/QuickIndex with oversized PPPOEPassword parameter. Stack-based buffer overflow overwrites return pointer, enabling code execution. Requires valid login credentials (PR:L) but publicly available POC guides exploitation.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 10, 2026

Stack-based buffer overflow in Tenda AC9 router firmware 15.03.02.13 allows authenticated remote attackers to execute arbitrary code via crafted PPPOEPassword parameter to formQuickIndex endpoint. Attack requires low-privilege credentials but no user interaction, enabling complete device compromise. Publicly available exploit code exists. CVSS 8.8 reflects network-accessible attack path with high impact to confidentiality, integrity, and availability.

RemediationAI

No vendor-released patch identified at time of analysis. Tenda has not published security advisories addressing this vulnerability per available data from https://www.tenda.com.cn/. Immediate mitigations: restrict administrative access to trusted IP ranges only, enforce strong authentication credentials, disable remote management interfaces if not operationally required. Monitor vendor site https://www.tenda.com.cn/ for firmware updates. Consider replacing device with actively maintained alternative if vendor does not release patch within acceptable timeframe. Review VulDB disclosure at https://vuldb.com/vuln/356571 for additional technical details.

Affected VersionsENISA

AC9 15.03.02.13

Affected Packages

euvd ac9 no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-121 stack overflow occurs in formQuickIndex function processing POST requests to /goform/QuickIndex endpoint. Insufficient bounds checking on PPPOEPassword input parameter allows attacker-controlled data to overflow stack memory. CVSS vector PR:L indicates authenticated exploitation requirement, limiting attack surface to credential holders.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (VulDB) PRIMARY 7.4 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Primary rating from Vendor (VulDB) · only source for this CVE.

CVSS VectorVendor: VulDB

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

PoC Detected

Apr 10, 2026 - 06:16 vuln.today

Public exploit code

CVE Published

Apr 10, 2026 - 04:45 nvd

HIGH 7.4

DescriptionCVE.org

A vulnerability has been found in Tenda AC9 15.03.02.13. Impacted is the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. Such manipulation of the argument PPPOEPassword leads to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.

Executive ViewAI

Why It Matters

Tenda AC9 routers running firmware 15.03.02.13 contain a stack-based buffer overflow in the PPPOEPassword parameter that allows low-privilege authenticated users to execute arbitrary code and fully compromise the device. With publicly available exploit code and no patch currently available, organizations using this router model face immediate risk of unauthorized access, data interception, and network infiltration.

Business Impact: Severe

Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: Disable remote management access to affected routers; implement network-level access controls restricting administrative interfaces to authorized IP ranges only; enforce multi-factor authentication for router administration if supported; monitor router logs for PPPOEPassword parameter abuse; consider device replacement with patched firmware or alternative vendor equipment.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% exploitable

Exploit

POC

Public exploit code exists

Social Media

Sightings

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment CIRCL

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 0.0%

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

Out-of-Cycle

Exploitation

Poc

System Exposure· derived

Open

Automatable

Human Impact

Very High

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +37

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.