CVE-2026-81640: Camera Wi-Fi Password Disclosure Vulnerability

CVE-2026-81640 Overview

CVE-2026-81640 is a hardcoded credential vulnerability [CWE-798] affecting an IP camera's built-in wireless access point. An attacker within radio range can derive the camera's Wi-Fi password using predictable device characteristics. Once connected to the wireless network, the attacker gains access to the live video stream, device services, status interfaces, and firmware-update functionality.

The vulnerability was disclosed through CISA Vulnerability Advisory VA-26-251-01. The flaw undermines the confidentiality, integrity, and availability of the affected device by rendering the access-point password ineffective as a security boundary.

Critical Impact
Adjacent-network attackers can bypass Wi-Fi authentication, intercept live video, and push firmware updates to the affected camera.

Affected Products

IP camera device with embedded Wi-Fi access point (vendor and model detailed in CISA advisory VA-26-251-01)
Firmware-update service exposed on the wireless interface
Device status and management interfaces reachable over the access-point network

Discovery Timeline

2026-09-09 - CVE-2026-81640 published to the National Vulnerability Database
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-81640

Vulnerability Analysis

The camera derives its Wi-Fi access-point password from values an attacker can predict or observe. This design makes the password effectively equivalent to a hardcoded credential [CWE-798]. An attacker within wireless range does not need prior authentication, user interaction, or physical access to the device.

Once joined to the network, the attacker reaches the same services a legitimate administrator would use. These include the live video stream, device status interfaces, and the firmware-update endpoint. Firmware access enables persistent compromise, including installation of modified images that survive reboots.

Root Cause

The root cause is deterministic Wi-Fi password generation tied to device attributes rather than a random secret provisioned per unit. Because the derivation algorithm produces the same output for a given input, any attacker who understands the scheme can compute the password. This pattern is the classic failure mode described by CWE-798, Use of Hard-coded Credentials.

Attack Vector

Exploitation requires adjacent-network access, meaning the attacker must be within radio range of the camera's Wi-Fi radio. No credentials or user interaction are required. After deriving the password and associating with the access point, the attacker gains network-layer reach to all services bound to the wireless interface.

The attack chain typically proceeds as follows: identify the target camera's SSID and observable identifiers, apply the derivation algorithm to compute the password, associate with the access point, and interact with the video stream, management, or firmware-update services. See the CISA Vulnerability Advisory VA-26-251-01 for vendor-specific technical detail.

Detection Methods for CVE-2026-81640

Indicators of Compromise

Unexpected client associations to the camera's Wi-Fi access point from unknown MAC addresses
Firmware-update transactions initiated from clients other than the administrator's provisioning workstation
Video stream sessions originating from devices not on the sanctioned management network
Configuration changes on the camera without a corresponding administrator action

Detection Strategies

Monitor the camera's association logs for new or anomalous wireless clients and alert on first-seen MAC addresses
Baseline expected RTSP, HTTP, and firmware endpoint traffic on the wireless segment, and flag deviations
Deploy wireless intrusion detection (WIDS) sensors to identify rogue clients probing device SSIDs
Correlate firmware-version changes reported by the device with authorized change-management records

Monitoring Recommendations

Forward camera syslog and management-plane telemetry into a centralized analytics platform for retention and correlation
Alert on any successful authentication to the device management interface from the wireless segment
Track firmware hashes across the fleet and generate alerts when any device reports an unexpected image

How to Mitigate CVE-2026-81640

Immediate Actions Required

Disable the built-in Wi-Fi access point where the device supports wired-only operation
Physically relocate cameras to reduce exposed radio range beyond controlled perimeters
Segment cameras onto isolated VLANs and restrict management access to specific administrator hosts
Review association logs for unknown clients and rotate any shared credentials associated with the device

Patch Information

Refer to CISA Vulnerability Advisory VA-26-251-01 for the authoritative list of affected models and vendor remediation guidance. Apply firmware updates that replace deterministic password derivation with per-device random secrets as soon as they become available from the vendor.

Workarounds

Configure the camera to use a wired uplink only and disable the wireless radio in device settings
Deploy the camera behind an external wireless controller that enforces WPA2/WPA3-Enterprise authentication
Place cameras inside a physically shielded enclosure or location that limits Wi-Fi propagation to authorized areas
Block outbound and lateral traffic from the camera subnet at the network firewall to contain any successful compromise

bash

# Example: isolate the camera VLAN and restrict management access
# Replace interface and address values to match your environment
vlan 42
  name IPCAM_ISOLATED

interface vlan 42
  ip access-group CAMERA_ACL in

ip access-list extended CAMERA_ACL
  permit tcp host 10.10.20.5 any eq 443
  deny   ip any any log