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Exploited vulnerability · CISA KEV

Is CVE-2020-24363 exploited? Yes: in CISA KEV since 2 Sep 2025

Gociux · TP-Link TL-WA855RE · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-24363, TP-link TL-WA855RE Missing Authentication for Critical Function Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Sep 2025, 1828 days after it was published. It affects TP-Link TL-WA855RE. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 2 Sep 2025
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity8.8CVSS 3.1 · high
US federal due23 Sep 2025BOD 22-01 deadline

What it is

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.

VendorTP-Link (6 exploited CVEs in KEV)
ProductTL-WA855RE
VulnerabilityTP-link TL-WA855RE Missing Authentication for Critical Function Vulnerability
WeaknessCWE-306
Published31 Aug 2020
Added to KEV2 Sep 2025
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for TL-WA855RE in your asset inventory, including appliances and cloud images. Stack check lists every exploited TP-Link CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 31 Aug 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for TP-Link.

References

Questions

Is CVE-2020-24363 being exploited?

Yes. CISA added CVE-2020-24363 to the Known Exploited Vulnerabilities catalog on 2 Sep 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-24363 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2020-24363?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check TP-Link's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected TL-WA855RE and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2025 · TP-Link scorecard · act-now radar.

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