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Varaxon Technologies

Known exploited vulnerability · CISA KEV

CVE-2020-24363: TP-link TL-WA855RE Missing Authentication for Critical Function Vulnerability

TP-link TL-WA855RE contains a missing authentication for critical function vulnerability. This vulnerability could allow an unauthenticated attacker (on the same network) to submit a TDDP_RESET POST request for a factory reset and reboot. The attacker can then obtain incorrect access control by setting a new administrative password. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

CVE-2020-24363

Exploited in the wild. Fix this first.

CISA added it to the Known Exploited Vulnerabilities catalog on 2025-09-02: attackers are using it right now.

CISA KEV
Listed
Added 2025-09-02 · federal fix-by 2025-09-23
EPSS (30 days)
22%
Higher than 98% of CVEs · 2026-11-01
CVSS
No score

What CISA says

TP-link TL-WA855RE Missing Authentication for Critical Function Vulnerability

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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How to check if you are exposed to CVE-2020-24363

  1. Find every TP-Link TL-WA855RE system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
  2. Compare each version with the fixed versions in the vendor advisory below. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
  3. Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2020-24363.

US federal agencies had to fix this by 2025-09-23. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.

Timeline

  1. · Added to CISA's Known Exploited Vulnerabilities catalog
  2. · Fix-by date for US federal agencies, passed 404 days ago

Vendor advisories and fixes

Weakness type

More exploited TP-Link vulnerabilities

CISA lists 6 exploited TP-Link vulnerabilities. The closest matches:

Keep going

Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

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