CVE-2021-42101

Name: CVE-2021-42101
Creator: NVD / NIST
Published: 2021-10-21T08:15:07.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2021-42101 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An uncontrolled search path element vulnerabilities in Trend Micro Apex One and Apex One as a Service could allow a local attacker to escalate privileges on affected installations. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

An uncontrolled search path element vulnerabilities in Trend Micro Apex One and Apex One as a Service could allow a local attacker to escalate privileges on affected installations. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. This vulnerability is similar but not identical to CVE-2021-42103.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.44%

35.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-427

Affected Software

Vendor	Product	Versions
Trendmicro	Apex One	2019

References

https://success.trendmicro.com/solution/000289229Patch, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1219/Third Party Advisory, VDB Entry
https://success.trendmicro.com/solution/000289229Patch, Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1219/Third Party Advisory, VDB Entry

Timeline

Published: Oct 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42101?

How severe is CVE-2021-42101?

CVE-2021-42101 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42101?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42101?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST