CVE-2025-15551 – This vulnerability allows attackers to execute ... (How to Fix)

Q: What is the severity of CVE-2025-15551?

CVE-2025-15551 has a CVSS score of 5.6 (MEDIUM). This vulnerability allows attackers to execute arbitrary JavaScript code on affected TP-Link router admin portals via Man-in-the-Middle attacks. The router's web interface improperly uses eval() without validation on responses, enabling code execution. Users of specific TP-Link router models with vulnerable firmware are affected.

📋 TL;DR

This vulnerability allows attackers to execute arbitrary JavaScript code on affected TP-Link router admin portals via Man-in-the-Middle attacks. The router's web interface improperly uses eval() without validation on responses, enabling code execution. Users of specific TP-Link router models with vulnerable firmware are affected.

💻 Affected Systems

Products:

TP-Link Archer MR200
TP-Link Archer C20
TP-Link TL-WR850N
TP-Link TL-WR845N

Versions: v5.2 for MR200, v6 for C20, v3 for WR850N, v4 for WR845N

Operating Systems: Router firmware

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in web interface response handling; all configurations using affected firmware versions are vulnerable.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete router compromise allowing attacker to change DNS settings, intercept all network traffic, install persistent backdoors, or disable security features.

🟠

Likely Case

Session hijacking, credential theft, network traffic redirection, or router configuration changes leading to further network compromise.

🟢

If Mitigated

Limited impact if HTTPS is enforced and network segmentation isolates router management interface.

🌐 Internet-Facing: MEDIUM - Requires MitM position but router admin portals often accessible from LAN only.

🏢 Internal Only: HIGH - Attackers on local network can exploit via ARP poisoning or compromised devices to gain router control.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires MitM position but no authentication needed. JavaScript execution occurs automatically when user visits admin portal.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check vendor links for latest firmware

Vendor Advisory: https://www.tp-link.com/en/support/download/

Restart Required: Yes

Instructions:

1. Visit TP-Link support page for your router model. 2. Download latest firmware. 3. Log into router admin portal. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Router will reboot automatically.

🔧 Temporary Workarounds

Disable remote management

all

Prevents admin portal access from WAN interface

Use wired connection for management

all

Reduces MitM attack surface by avoiding wireless for admin access

🧯 If You Can't Patch

Segment router management to dedicated VLAN isolated from user devices
Implement HTTPS enforcement and certificate pinning if supported

🔍 How to Verify

Check if Vulnerable:

Check router firmware version in admin portal under System Tools > Firmware Upgrade

Check Version:

Login to router admin portal and navigate to System Tools > Firmware Upgrade

Verify Fix Applied:

Verify firmware version matches latest from TP-Link website and test admin portal functionality

📡 Detection & Monitoring

Log Indicators:

Unusual JavaScript execution in router logs
Multiple failed login attempts followed by configuration changes

Network Indicators:

ARP spoofing detection
Unusual DNS queries from router
HTTPS to HTTP downgrade attempts

SIEM Query:

source="router_logs" AND (event="eval" OR event="javascript_execution")

📊 Metadata

CVE ID: CVE-2025-15551

CVSS v3 Score: 5.6 (MEDIUM)

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

CWE: CWE-95

EPSS Score: 0.09% exploit probability (24.8th percentile)

Published: February 5, 2026

Last Updated: February 12, 2026

🔗 References

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