CVE-2021-36742 (GCVE-0-2021-36742)
Vulnerability from cvelistv5 – Published: 2021-07-29 19:23 – Updated: 2025-10-21 23:25Summary
A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1 allows 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.
Severity
7.8 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-06 19:39 UTC
CWE
- Local Privilege Escalation
- CWE-20 - Improper Input Validation
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://success.trendmicro.com/solution/000287819 | x_refsource_MISC |
| https://success.trendmicro.com/solution/000287820 | x_refsource_MISC |
| https://success.trendmicro.com/jp/solution/000287796 | x_refsource_MISC |
| https://success.trendmicro.com/jp/solution/000287815 | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Trend Micro | Trend Micro Apex One |
Affected:
2019, SaaS
|
|
| Trend Micro | Trend Micro OfficeScan |
Affected:
XG SP1
|
|
| Trend Micro | Trend Micro Worry-Free Business Security |
Affected:
10.0 SP1
|
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c3f5b764-039f-45da-a399-a40481a0f9a8
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Trend Micro Multiple Products Improper Input Validation Vulnerability | Affected: Trend Micro / Apex One, Apex One as a Service, and Worry-Free Business Security | Description: Trend Micro Apex One, Apex One as a Service, and Worry-Free Business Security contain an improper input validation vulnerability that allows for privilege escalation. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://success.trendmicro.com/dcx/s/solution/000287819?language=en_US, https://success.trendmicro.com/dcx/s/solution/000287820?language=en_US; https://nvd.nist.gov/vuln/detail/CVE-2021-36742
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-20 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Apex One, Apex One as a Service, and Worry-Free Business Security |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Trend Micro |
| Vulnerabilityname | Trend Micro Multiple Products Improper Input Validation Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-10-02 08:10 CEST
| Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fa1ad001-e09c-42fb-a9d7-25b45fefe82e
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1... | Affected: Trend Micro / Trend Micro Apex One, Trend Micro OfficeScan, Trend Micro Worry-Free Business Security | CVSS: 7.8 (HIGH) | EPSS: 0.01482 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | A improper input validation vulnerability in Trend Micro Apex One, Apex One as a Service, OfficeScan XG and Worry-Free Business Security 10.0 SP1... |
| Cve Id | CVE-2021-36742 |
| Vendor | Trend Micro |
| Ghsa Id | None |
| Product | Trend Micro Apex One, Trend Micro OfficeScan, Trend Micro Worry-Free Business Security |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 7.8 |
| Epss Score | 0.01482 |
| Previous Ids | |
| Cvss Severity | HIGH |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.72942 |
| Used In Malware | unknown |
| Vulnerability Id | CVE-2021-36742 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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