Exploited. On CISA's list since 2022-09-15.
Trend Micro Apex One and Apex One as a Service Improper Validation Vulnerability
CVE-2022-40139 · Trend Micro Apex One and Apex One as a Service · Published 2022-09-19
How bad would it be?
7.2 out of 10
CVSS rates it high.
How likely is it to be used?
3.4%
Estimated chance of exploitation in the next 30 days, higher than 88% of all scored flaws (EPSS, 2026-10-29).
Is it already being used?
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1485 days ago (2022-10-06).
What CISA says to do
Apply updates per vendor instructions.
Trend Micro Apex One and Apex One as a Service contain an improper validation of rollback mechanism components that could lead to remote code execution.
What the flaw is
Improper validation of some components used by the rollback mechanism in Trend Micro Apex One and Trend Micro Apex One as a Service clients could allow a Apex One server administrator to instruct affected clients to download an unverified rollback package, which could lead to remote code execution. Please note: an attacker must first obtain Apex One server administration console access in order to exploit this vulnerability.
From the NVD.
Fixes and advisories
Learn this
Explore this week’s weaknesses and all learning topics
Understand the kind of weakness behind this flaw. These resources teach the weakness, rather than reproduce this specific CVE. Follow the vendor's advice above to fix the affected product.
CWE-353 · CISA KEV. We have not selected a close learning match for this label.
CWE-641 · CISA KEV. We have not selected a close learning match for this label.
CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.
On SentryFeed
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.