CVE-2026-76584: TRENDnet TV-IP751WIC Buffer Overflow Flaw

CVE-2026-76584 Overview

CVE-2026-76584 is a stack-based buffer overflow affecting TRENDnet TV-IP751WIC firmware version 11.03.03. The flaw resides in the alphapd web server component, specifically in the /cgi-bin/admin/set_time.cgi endpoint. Attackers can manipulate the Currenttime argument to trigger memory corruption on the stack. The vulnerability is remotely exploitable and a public proof-of-concept has been released, increasing the likelihood of opportunistic attacks against exposed devices. This weakness is categorized under [CWE-119] (Improper Restriction of Operations within the Bounds of a Memory Buffer).

Critical Impact
Remote attackers with low-privileged access can corrupt memory in the alphapd process, potentially achieving arbitrary code execution on affected TRENDnet IP camera devices.

Affected Products

TRENDnet TV-IP751WIC firmware 11.03.03
Component: alphapd embedded web server
Endpoint: /cgi-bin/admin/set_time.cgi

Discovery Timeline

2026-08-19 - CVE-2026-76584 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-76584

Vulnerability Analysis

The vulnerability exists in the time configuration handler exposed by the alphapd web server on the TRENDnet TV-IP751WIC. When a request is made to /cgi-bin/admin/set_time.cgi, the handler processes the Currenttime parameter without enforcing proper length validation. Supplying an oversized value overflows a fixed-size stack buffer, corrupting adjacent stack memory including saved return addresses. Successful exploitation can redirect execution flow within the embedded process, which typically runs with elevated privileges on IP cameras. Because the device exposes its administrative interface over HTTP, an authenticated attacker on the network can trigger the flaw remotely. Public disclosure of a proof-of-concept increases the operational risk for internet-exposed devices.

Root Cause

The root cause is missing bounds checking on user-supplied input in the set_time.cgi handler within alphapd. The Currenttime argument is copied into a stack-allocated buffer using an unsafe operation that does not validate the length of the incoming data against the destination buffer size.

Attack Vector

Exploitation requires network access to the device management interface and low-privileged credentials. An attacker sends a crafted HTTP request to /cgi-bin/admin/set_time.cgi with an overlong Currenttime parameter. The public proof-of-concept poc-time-injection.py demonstrates the request structure. See the GitHub PoC Repository for technical details.

Detection Methods for CVE-2026-76584

Indicators of Compromise

HTTP POST or GET requests to /cgi-bin/admin/set_time.cgi containing abnormally long Currenttime parameter values.
Unexpected restarts or crashes of the alphapd process on TRENDnet TV-IP751WIC devices.
Outbound connections from IP camera devices to unfamiliar hosts following administrative interface access.

Detection Strategies

Inspect web server and reverse-proxy logs for requests targeting set_time.cgi with parameter values exceeding expected length thresholds.
Deploy network intrusion detection signatures that flag oversized query strings or POST bodies directed at the alphapd administrative endpoints.
Correlate authentication events on IP cameras with subsequent configuration changes to detect suspicious low-privilege access patterns.

Monitoring Recommendations

Enable centralized logging from IoT and network devices, forwarding events to a SIEM for retention and analysis.
Monitor management VLANs for unauthorized HTTP traffic originating outside expected administrative subnets.
Baseline normal request patterns to /cgi-bin/admin/ endpoints and alert on deviations in payload size or frequency.

How to Mitigate CVE-2026-76584

Immediate Actions Required

Remove TRENDnet TV-IP751WIC devices running firmware 11.03.03 from direct internet exposure and restrict management access to trusted networks only.
Change default and low-privileged administrative credentials to strong, unique values to limit the pool of accounts that can reach the vulnerable endpoint.
Segment IP cameras and other embedded devices onto isolated VLANs with strict egress filtering.

Patch Information

At the time of publication, no vendor patch has been referenced in the available CVE data. Consult the VulDB CVE Entry and the TRENDnet support portal for updates on official firmware fixes.

Workarounds

Disable remote administrative access to the device where not required for operations.
Place the device behind a reverse proxy or web application firewall configured to enforce strict length limits on parameters submitted to /cgi-bin/admin/set_time.cgi.
Restrict access to alphapd administrative endpoints using network access control lists that permit only designated management hosts.

bash

# Example firewall rule restricting device management access to a trusted subnet
iptables -A FORWARD -s 10.10.20.0/24 -d 192.168.1.50 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 192.168.1.50 -p tcp --dport 80 -j DROP