CVE-2023-27065 – This CVE describes a buffer overflow vulnerabil... (How to Fix)

Q: What is the severity of CVE-2023-27065?

CVE-2023-27065 has a CVSS score of 7.5 (HIGH). This CVE describes a buffer overflow vulnerability in Tenda W15EV1 routers via the picName parameter in the formDelWewifiPi function. Attackers can exploit this to cause Denial of Service (DoS) through crafted requests. Users of affected Tenda router models with vulnerable firmware versions are impacted.

📋 TL;DR

This CVE describes a buffer overflow vulnerability in Tenda W15EV1 routers via the picName parameter in the formDelWewifiPi function. Attackers can exploit this to cause Denial of Service (DoS) through crafted requests. Users of affected Tenda router models with vulnerable firmware versions are impacted.

💻 Affected Systems

Products:

Tenda W15EV1 router

Versions: V15V1.0 V15.11.0.14(1521_3190_1058)

Operating Systems: Embedded router firmware

Default Config Vulnerable: ⚠️ Yes

Notes: Affects specific firmware version on Tenda W15EV1 router model

📦 What is this software?

W15e Firmware by Tenda

View all CVEs affecting W15e Firmware →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete router crash requiring physical reboot, potential for remote code execution if buffer overflow can be controlled to execute arbitrary code

🟠

Likely Case

Router becomes unresponsive, requiring reboot to restore functionality, disrupting network connectivity

🟢

If Mitigated

Limited to DoS impact if proper input validation and memory protections are implemented

🌐 Internet-Facing: HIGH - Routers are typically internet-facing devices, and the vulnerability can be exploited remotely via crafted requests

🏢 Internal Only: MEDIUM - Could be exploited from internal network if attacker gains access

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Public proof-of-concept available in GitHub repository, exploitation appears straightforward via crafted HTTP requests

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown

Vendor Advisory: Not available

Restart Required: Yes

Instructions:

1. Check Tenda official website for firmware updates 2. Download latest firmware for W15EV1 3. Upload via router admin interface 4. Reboot router after update

🔧 Temporary Workarounds

Disable remote management

all

Prevent external access to router management interface

Login to router admin > Advanced Settings > Remote Management > Disable

Network segmentation

all

Isolate router management interface to trusted network segment

🧯 If You Can't Patch

Replace affected router with updated model or different vendor
Implement network firewall rules to restrict access to router management interface

🔍 How to Verify

Check if Vulnerable:

Check router firmware version in admin interface: System Status > Firmware Version

Check Version:

Login to router web interface and navigate to System Status page

Verify Fix Applied:

Verify firmware version is updated beyond V15.11.0.14(1521_3190_1058)

📡 Detection & Monitoring

Log Indicators:

Multiple failed HTTP requests to formDelWewifiPi endpoint
Router reboot events without user action
Unusual long parameter values in HTTP requests

Network Indicators:

HTTP POST requests with abnormally long picName parameter values to router management interface

SIEM Query:

source="router_logs" AND (uri="/goform/DelWewifiPic" OR uri="/goform/formDelWewifiPi") AND param_length>100

📊 Metadata

CVE ID: CVE-2023-27065

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-120

Published: March 13, 2023

Last Updated: February 27, 2025

🔗 References

https://github.com/didi-zhiyuan/vuln/blob/main/iot/Tenda/W15EV1/formDelWewifiPic.md Exploit,Third Party Advisory
https://github.com/didi-zhiyuan/vuln/blob/main/iot/Tenda/W15EV1/formDelWewifiPic.md Exploit,Third Party Advisory

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