CVE-2020-24557A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporar…
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It affects Trend Micro Apex One and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022. Treat that date as your deadline.
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A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft Windows may allow an attacker to manipulate a particular product folder to disable the security temporarily, abuse a specific Windows function and attain privilege escalation. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. Please note that version 1909 (OS Build 18363.719) of Microsoft Windows 10 mitigates hard links, but previous versions are affected.
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022Apply updates per vendor instructions.
- EPSS (exploitation in the next 30 days)
- 2.67% (percentile 85)
- Assigned by
- trendmicro
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Trend Micro Trend Micro Apex One trend_micro:apex_one (from the name) | 2009 (on premise), SaaS | CNA record |
Trend Micro Trend Micro Worry-Free Business Security trend_micro:worry_free_business_security (from the name) | 10.0 SP1 | CNA record |
trendmicro apex_one trendmicro:apex_one | all versions; 2019 | NVD |
trendmicro worry-free_business_security trendmicro:worry-free_business_security | 10.0 | NVD |
References
- https://success.trendmicro.com/solution/000263632x-refsource-misc, vendor-advisory
- https://www.zerodayinitiative.com/advisories/ZDI-20-1094/x-refsource-misc, third-party-advisory, vdb-entry
- https://success.trendmicro.com/solution/000267260x-refsource-misc, vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-24557us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.