Trend Micro Apex One and OfficeScan Authentication Bypass Vulnerability
Trend Micro Apex One and OfficeScan server contain a vulnerable EXE file that could allow a remote attacker to write data to a path on affected installations and bypass root login.
- Vendor
- Trend Micro
- Product
- Apex One and OfficeScan
- CVSS
- 9.8
- EPSS (exploit probability)
- 11.9%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2020-8599 being exploited?
Yes. CISA added CVE-2020-8599 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 11.9% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-24. Full cross-catalog view: /kev-comparison
CVE-2020-8599 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (181 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Trend Micro CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2026-34926 Trend Micro Apex One (On-Premise) Directory Traversal Vulnerability | [ MEDIUM ] | 6.7 | 0.5% | |
| CVE-2025-54948 Trend Micro Apex One OS Command Injection Vulnerability | [ CRITICAL ] | 9.4 | 23.9% | |
| CVE-2023-41179 Trend Micro Apex One and Worry-Free Business Security Remote Code Execution Vulnerability | [ HIGH ] | 7.2 | 4.3% | |
| CVE-2022-40139 Trend Micro Apex One and Apex One as a Service Improper Validation Vulnerability | [ HIGH ] | 7.2 | 3.3% | |
| CVE-2022-26871 Trend Micro Apex Central Arbitrary File Upload Vulnerability | [ CRITICAL ] | 9.8 | 19.5% | |
| CVE-2021-36742 Trend Micro Multiple Products Improper Input Validation Vulnerability | [ HIGH ] | 7.8 | 1.5% | |
| CVE-2021-36741 Trend Micro Multiple Products Improper Input Validation Vulnerability | [ HIGH ] | 8.8 | 5.0% | |
| CVE-2020-8468 Trend Micro Multiple Products Content Validation Escape Vulnerability | [ HIGH ] | 8.8 | 6.2% |