What it is
CVE-2020-24557 is a vulnerability affecting Trend Micro Trend Micro Apex One, Trend Micro Worry-Free Business Security. A vulnerability in Trend Micro Apex One and Worry-Free Business Security 10.0 SP1 on Microsoft...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2020-24557
Trend Micro Apex One Privilege Escalation
Trend Micro / Trend Micro Apex One · 2009 (on premise), SaaS
- Severity
- CVSS 7.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 2.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Trend Micro / Trend Micro Apex One 2009 (on premise), saas.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Trend Micro Apex One Privilege Escalation
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.
Vendor
Product
Affected
Status
Trend Micro
Trend Micro Apex One
2009 (on premise), SaaS
Affected
Trend Micro
Trend Micro Worry-Free Business Security
10.0 SP1
Affected
- Published
- 01 Sep 2020
- Exploitation Reported
- 03 Nov 2021
- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
Tags
cisa
windows
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2020-24557
- success.trendmicro.com/solution/000263632 success.trendmicro.com · CVE Record https://success.trendmicro.com/solution/000263632
- zerodayinitiative.com/advisories/ZDI-20-1094 zerodayinitiative.com · CVE Record https://www.zerodayinitiative.com/advisories/ZDI-20-1094/
- success.trendmicro.com/solution/000267260 success.trendmicro.com · CVE Record https://success.trendmicro.com/solution/000267260
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2021-11-03 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
7.8
High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
2.6%
All CVSS Scores
CVSS v3.1
7.8
High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v2.0
7.2
High
AV:L/AC:L/Au:N/C:C/I:C/A:C
Timeline
From disclosure to observed exploitation
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2020-24557
Free JSON includes basic KEV fields{
"cve_id": "CVE-2020-24557",
"confidence": "Confirmed",
"cvss_score": 7.8,
"cvss_estimated": false,
"epss_score": 0.02639,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.