Out-of-bounds write in Trend Micro Apex One
Priority LOW 34CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
An out-of-bounds write information disclosure vulnerability in Trend Micro Apex One (on-prem and SaaS), OfficeScan XG SP1, and Worry-Free Business Security (10.0 SP1 and Services) could allow a local attacker to escalate privileges on affected installations. Please note: an attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
Why it matters now
EPSS 0.00431 37th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Trend Micro | Trend Micro Apex One | 2019, SaaS | — | No fix listed | CNA |
| Trend Micro | Trend Micro OfficeScan | XG SP1 | — | No fix listed | CNA |
| Trend Micro | Trend Micro Worry-Free Business Security | 10.0 SP1, Services (SaaS) | — | No fix listed | CNA |
- Trend Micro Apex One VendorTrend Micro Affected 2019, SaaS Fixed in — No fix listed CNA
- Trend Micro OfficeScan VendorTrend Micro Affected XG SP1 Fixed in — No fix listed CNA
- Trend Micro Worry-Free Business Security VendorTrend Micro Affected 10.0 SP1, Services (SaaS) Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* | 2019 | Vulnerable | Trendmicro |
| cpe:2.3:a:trendmicro:officescan:xg:sp1:*:*:*:*:*:* | xg sp1 | Vulnerable | Trendmicro |
| cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* | 10.0 sp1 | Vulnerable | Trendmicro |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:trendmicro:apex_one:2019:*:*:*:*:*:*:* Versions 2019 Vulnerable ·Trendmicro
- cpe:2.3:a:trendmicro:officescan:xg:sp1:*:*:*:*:*:* Versions xg sp1 Vulnerable ·Trendmicro
- cpe:2.3:a:trendmicro:worry-free_business_security:10.0:sp1:*:*:*:*:*:* Versions 10.0 sp1 Vulnerable ·Trendmicro
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-25249
- 2026-10-03 Alias added: GHSA-2q3x-mqw8-qf9r
References
More Trend Micro vulnerabilities
- TI-2025-34668 OS command injection in Trend Micro Apex One KEVCVSS 3.1CRITICAL 9.8
- TI-2022-10115 Insufficient verification of data authenticity in Trend Micro Apex Central KEVCVSS 3.1CRITICAL 9.8
- TI-2020-06895 Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that… KEVCVSS 3.1CRITICAL 9.8
- TI-2021-14867 Unrestricted file upload in Trend Micro Apex One KEVCVSS 3.1HIGH 8.8
- TI-2020-06795 Injection in Trend Micro OfficeScan, Trend Micro Apex One, Trend Micro Worry-Free… KEVCVSS 3.1HIGH 8.8
- TI-2020-06794 A migration tool component of Trend Micro Apex One (2019) and OfficeScan XG contains a… KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2021-25249 · CVE Program
- CVE-2021-25249 · NVD
- FIRST EPSS
- GHSA-2q3x-mqw8-qf9r · GitHub Advisory Database · CC BY 4.0
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