CVE-2026-102294 Overview
CVE-2026-102294 is an authenticated operating system command injection vulnerability in the TP-Link TL-WR841N wireless router. The flaw resides in the IPv6 Wide Area Network (WAN) configuration interface, where a crafted IPv6 Gateway value is improperly incorporated into a system command. An authenticated administrator on the adjacent network can supply shell metacharacters in the Gateway field to execute arbitrary commands on the underlying operating system. The weakness is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command.
Critical Impact
Successful exploitation allows attackers to read sensitive device data, alter router configuration or services, and disrupt network operation on affected TL-WR841N devices.
Affected Products
- TP-Link TL-WR841N wireless router (v14 firmware line referenced by vendor downloads)
- Deployments where IPv6 WAN configuration is enabled
- Devices reachable by an authenticated administrator over the adjacent network
Discovery Timeline
- 2026-10-01 - CVE-2026-102294 published to the National Vulnerability Database
- 2026-10-02 - Last updated in NVD database
Technical Details for CVE-2026-102294
Vulnerability Analysis
The TL-WR841N web management interface accepts user-supplied IPv6 configuration values for the WAN connection. When an administrator submits an IPv6 Gateway address, the firmware concatenates that value into a shell command without proper neutralization of metacharacters. Shell operators such as ;, |, backticks, or $() embedded in the Gateway field are evaluated by the system shell during command execution.
Because router management utilities typically run as root on embedded Linux, injected commands execute with the highest privilege on the device. Attackers can modify firewall rules, extract credentials from configuration storage, pivot to internal clients, or render the router inoperable. The attack requires valid administrator credentials and adjacent network access, which limits remote exploitation but aligns with scenarios where credentials are reused, defaulted, or recovered through prior compromise.
Root Cause
The root cause is missing input validation and output encoding on the IPv6 Gateway parameter before it is passed to a shell interpreter. The configuration handler treats the field as a trusted string rather than validating it against the IPv6 address grammar defined in RFC 4291, allowing arbitrary characters to reach the OS command layer.
Attack Vector
An attacker with administrator credentials connects to the router's web interface over the local or adjacent network. The attacker navigates to the IPv6 WAN configuration page and submits a Gateway value containing shell metacharacters followed by arbitrary commands. The firmware applies the configuration, invokes the vulnerable command, and executes the injected payload. See the TP-Link TL-WR841N firmware page and the TP-Link FAQ document for firmware upgrade procedures. A verified public proof of concept is not currently available.
Detection Methods for CVE-2026-102294
Indicators of Compromise
- Unexpected changes to IPv6 WAN configuration, especially Gateway values containing non-IPv6 characters such as ;, |, &, backticks, or $().
- New or modified processes running on the router outside the normal firmware baseline.
- Outbound connections from the router to unfamiliar hosts following administrative sessions.
Detection Strategies
- Review router administrative audit logs for IPv6 WAN configuration changes correlated with suspicious administrator logins.
- Inspect saved router configuration backups for Gateway fields that do not conform to valid IPv6 address syntax.
- Monitor network telemetry for routers initiating outbound shell, DNS tunneling, or reverse-connect traffic to attacker-controlled infrastructure.
Monitoring Recommendations
- Forward router syslog and management-plane events to a centralized log platform for correlation.
- Alert on administrator authentication from unexpected source addresses or outside maintenance windows.
- Baseline router outbound connections and alert on deviations that may indicate post-exploitation activity.
How to Mitigate CVE-2026-102294
Immediate Actions Required
- Apply the latest TP-Link TL-WR841N v14 firmware available on the TP-Link firmware download page.
- Rotate administrator credentials and remove any default or reused passwords on the device.
- Restrict management interface access to a dedicated administrative VLAN or trusted IP range.
Patch Information
TP-Link publishes firmware updates for the TL-WR841N on its support site. Administrators should download the latest v14 firmware image from the vendor firmware page and follow the upgrade steps described in the TP-Link FAQ document. Verify the installed firmware version after the upgrade to confirm the patch is active.
Workarounds
- Disable the IPv6 WAN connection where IPv6 service is not required, removing the vulnerable configuration path.
- Limit administrator accounts to the minimum necessary set and enforce strong, unique passwords.
- Block web management access from wireless and guest network segments to reduce the adjacent attack surface.
# Example: restrict router management access to a dedicated admin host
# Replace 192.0.2.10 with your administrative workstation IP
# and 192.168.0.1 with the router management address
iptables -A FORWARD -s 192.0.2.10 -d 192.168.0.1 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 192.168.0.1 -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.