TP-Link Archer C7 and TL-WR841N Parental Control Remote Command Execution (RCE) Vulnerability (CVE-2025-9377)
Executive & SecOps Summary
SECOPS ASSESSMENTEnd-of-Life (EOL) TP-Link Archer C7(EU) V2 (prior to 241108) and TL-WR841N/ND(MS) V9 (prior to 241108) routers.
Authenticated attackers can execute arbitrary system commands and gain full control of the device via the Parental Control configuration page.
Since these products are EOL, purchasing new supported hardware is highly recommended; otherwise, apply the emergency patch immediately and restrict management access.
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Although these devices are EOL, TP-Link has provided emergency patches. If immediate replacement is not feasible, download the patch from the official vendor advisory and upgrade the firmware manually.
# 1. Download the appropriate patch firmware (version 241108 or later) from the TP-Link support page.
# 2. Extract the ZIP archive to obtain the .bin firmware file.
# 3. Upload and apply the firmware via the Web GUI or using a command-line utility if supported:
curl -X POST -F 'archive=@TP-Link_Firmware_Patch_241108.bin' http://192.168.0.1/incoming/FirmwareUpgrade2. Temporary Workaround & Hardening Configuration
To mitigate the risk before patching or replacing the hardware, disable Remote Management and restrict access to the web console to trusted local IP addresses only.
# Block external WAN access to the router's web administration ports (80, 443, 8080)
# Apply the following iptables rules on an upstream firewall if available:
iptables -A FORWARD -p tcp -d 192.168.0.1 --dport 80 -m state --state NEW -j DROP
iptables -A FORWARD -p tcp -d 192.168.0.1 --dport 443 -m state --state NEW -j DROP3. Log Audit & IoC Verification Commands
Use the following script to check the router's responsiveness and scan for open management ports that might indicate unauthorized access or exposure.
#!/bin/bash
# Verify the router's HTTP server header and check for open management ports
TARGET_IP='192.168.0.1'
echo '[*] Checking target router HTTP headers...'
curl -s -I http://$TARGET_IP | grep -E -i 'Server|TP-LINK' || echo '[!] Target did not return expected headers.'
echo '[*] Scanning for exposed management ports...'
nc -zv -w 2 $TARGET_IP 21 22 23 80 443 8080Stop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2025-9377) is an OS command injection vulnerability (CWE-78) residing in the 'Parental Control' configuration page of legacy TP-Link routers, specifically Archer C7(EU) V2 and TL-WR841N/ND(MS) V9. The root cause is the lack of proper input validation and sanitization on user-supplied parameters within the Parental Control settings. When an authenticated user inputs malicious shell metacharacters, the backend system executes them directly within the operating system shell context.
2. Exploitation Mechanics & Attack Scenario
An attacker must first obtain authenticated access to the router's web management interface (e.g., via default credentials or brute-force attacks). Once authenticated, the attacker sends a crafted HTTP request to the Parental Control configuration endpoint containing shell metacharacters (such as ;, &, or |) followed by arbitrary commands. Because the router's web server executes these inputs via a system shell call (e.g., sh -c) without sanitization, the injected commands run with administrative privileges, allowing the attacker to download malware, establish reverse shells, or join botnets.
3. Infrastructure & Business Impact
This vulnerability is actively exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog. Compromised routers can be leveraged as initial access points to pivot into internal corporate networks, perform DNS hijacking, sniff local network traffic, or enlist the devices into DDoS botnets (such as Mirai), posing severe operational, financial, and reputational risks to organizations and home offices alike.
Official Vendor Advisories & References
The authenticated remote command execution (RCE) vulnerability exists in the Parental Control page on TP-Link Archer C7(EU) V2 and TL-WR841N/ND(MS) V9. This issue affects Archer C7(EU) V2: before 241108 and TL-WR841N/ND(MS) V9: before 241108. Both products have reached the status of EOL (end-of-life). It's recommending to purchase the new product to ensure better performance and security. If replacement is not an option in the short term, please use the second reference link to download and install the patch(es).
Frequently Asked SecOps Questions (CVE-2025-9377)
FAQQ1. How critical is CVE-2025-9377 and is it actively exploited in the wild?
CVE-2025-9377 is rated CVSS 7.2 (HIGH) with a 30-day EPSS exploitation probability of 41.3%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2025-9377?
Primary impacted vendors include tp-link across archer c7, tl-wr841n, tl-wr841nd. Scope summary: TP-Link Archer C7(EU) V2: Versions prior to 241108 TP-Link TL-WR841N/ND(MS) V9: Versions prior to 241108 *Note: Both products have reached End-of-Life (EOL) status.
Q3. What temporary mitigations or workarounds exist for CVE-2025-9377 before patching?
[Mitigation] Since these products are EOL, purchasing new supported hardware is highly recommended; otherwise, apply the emergency patch immediately and restrict management access. Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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