TP-Link TL-WA855RE Zero-Day Vulnerability (Missing Authentication)

Device Affected: TP-Link TL-WA855RE Wi-Fi Range Extender
Vulnerability: Missing authentication for a critical function—unauthenticated attackers on the same network can send a TDDP_RESET POST request to force a factory reset and then set a new administrative password SecurityWeek The Hacker News Security Affairs.
CISA Action: This flaw, listed as CVE-2020-24363, has been added to CISA’s Known Exploited Vulnerabilities (KEV) catalog, as it’s actively exploited The Hacker News Security Affairs.

Risk Snapshot

Risk Area	Details
Attack Vector	Network-based, no credentials needed
Impact	Full device takeover—config reset, new admin control
Severity	High—CVSS 8.8/10 The Hacker News Security Affairs
Status	End-of-Life (EoL)—no future patches The Hacker News Security Affairs
CISA Deadline	Patch or replace by September 23, 2025 for federal agencies The Hacker News Security Affairs

Upgrade or Replace:
Flash the latest firmware if possible; otherwise, discontinue use. Given its EoL status, the safest path is replacement.
Disable Local Admin Access:
Block access to the TDDP interface or local web admin. Limit to secure segments if continued use is mandatory.
Network Segmentation:
Isolate the extender from critical systems. Enforce strict control via VLANs or firewall rules.
Detect & Monitor:
Watch for factory reset events or uncharacteristic admin changes. Use intrusion detection tools to flag attempts.
Explore WAF or Network Filters:
Block TDDP_RESET or similar requests using network-level controls or a Web Application Firewall if feasible.

Apps & Tools: cyberdudebivash.com/apps — For quick peripheral and router vulnerability scanning
Threat Intel: cyberbivash.blogspot.com — Stay ahead with live CVE alerts
IoT & Plugin Insights: cryptobivash.code.blog — In-depth analysis for IoT and unmanaged device security
Incident Playbooks & Consulting: Step-by-step guides for emergency patching and risk response

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