CVE-2026-86153 Overview
CVE-2026-86153 is an improper privilege management vulnerability [CWE-266] in the Tenda CP3 IP camera running firmware version 27.5.57.101. The flaw resides in the CRedirServer::SetRedirectEnable function within Functions/Redirect.cpp. Remote attackers can manipulate this function to bypass privilege controls on the device. The vulnerability affects the confidentiality, integrity, and availability of the target system and can extend impact to subsequent components.
Critical Impact
Remote attackers with high privileges can exploit improper privilege management in the Tenda CP3 redirect service to gain unauthorized control over camera functionality and pivot into connected network segments.
Affected Products
- Tenda CP3 IP Camera
- Firmware version 27.5.57.101
- Component: Functions/Redirect.cpp — CRedirServer::SetRedirectEnable
Discovery Timeline
- 2026-09-06 - CVE-2026-86153 published to the National Vulnerability Database
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-86153
Vulnerability Analysis
The vulnerability exists in the CRedirServer::SetRedirectEnable function of the Tenda CP3 firmware. This function governs the redirect service state on the device but fails to enforce proper privilege checks before applying state changes. An attacker able to reach the affected endpoint over the network can invoke the function and alter privileged behavior of the camera's redirect component.
The weakness is classified under CWE-266: Incorrect Privilege Assignment. Improper privilege management allows operations that should be restricted to higher-trust contexts to execute under attacker-controlled input. Because the CP3 firmware exposes management interfaces over the network, exploitation does not require physical access.
Successful exploitation results in full compromise of confidentiality, integrity, and availability on the affected device. The impact also propagates to subsequent systems the camera interacts with, including video feeds, storage endpoints, and network infrastructure the camera can reach.
Root Cause
The root cause is missing or insufficient authorization enforcement inside CRedirServer::SetRedirectEnable. The function accepts requests that modify redirect state without validating that the requester holds the required privilege level. This design flaw is consistent with CWE-266, where a privileged capability is exposed to a lower-privilege context.
Attack Vector
Exploitation occurs over the network against a reachable Tenda CP3 device. An attacker sends crafted requests to the redirect service endpoint that invokes CRedirServer::SetRedirectEnable. Because the function does not correctly validate the caller's privilege level, the attacker can toggle or manipulate redirect behavior and gain elevated control over the affected component.
No verified public exploit code was available at the time of publication. Technical details are tracked in the VulDB entry for CVE-2026-86153 and the associated VulDB Vulnerability #399276.
Detection Methods for CVE-2026-86153
Indicators of Compromise
- Unexpected changes to redirect configuration on Tenda CP3 cameras running firmware 27.5.57.101.
- HTTP or management-plane requests targeting the redirect service from unknown or external source addresses.
- Outbound traffic from CP3 devices to unexpected destinations following configuration changes.
Detection Strategies
- Inventory all Tenda CP3 cameras and identify units running firmware version 27.5.57.101.
- Monitor management-interface access logs for requests that alter redirect state, especially from non-administrative source IPs.
- Baseline normal camera behavior and alert on deviations in outbound connections or configuration state.
Monitoring Recommendations
- Forward camera and network telemetry to a centralized data lake for correlation with authentication events.
- Alert on repeated authentication attempts against the CP3 management interface.
- Track configuration drift on IoT devices using periodic state comparisons against a known-good baseline.
How to Mitigate CVE-2026-86153
Immediate Actions Required
- Restrict network access to Tenda CP3 management interfaces to trusted administrative networks only.
- Change default and shared credentials on all CP3 devices and enforce strong, unique passwords.
- Segment IP cameras onto isolated VLANs with strict egress filtering to limit lateral movement.
- Audit CP3 devices for unauthorized configuration changes to the redirect service.
Patch Information
No vendor patch has been referenced in public advisories at the time of publication. Monitor the Tenda official website and the VulDB CVE-2026-86153 entry for firmware updates addressing this issue.
Workarounds
- Block inbound network access to the CP3 redirect and management services at the perimeter firewall.
- Place affected cameras behind a VPN or reverse proxy that enforces authentication before reaching the device.
- Disable remote management features where operationally feasible.
- Remove internet exposure of CP3 devices identified through external attack surface scans.
# Example firewall rule to restrict CP3 management access
iptables -A INPUT -s 10.0.0.0/24 -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -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.
