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CVE-2021-36742 (GCVE-0-2021-36742)

Vulnerability from cvelistv5 – Published: 2021-07-29 19:23 – Updated: 2025-10-21 23:25
VLAI CISA Previdian
Summary
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)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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
Impacted products
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 9a1919c5-62df-4609-a453-949df0b0b3fb

Vulnerability ID: CVE-2021-36742

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: 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: 2026-02-02 12:29 UTC | Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 790e302d-3c5c-4956-b619-feeda702b86d

Vulnerability ID: CVE-2021-36742

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: 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) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.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...
Vendor Trend Micro
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 None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:04 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "current_release_date": "2026-03-27T13:48:27+00:00",
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      "id": "CVE-2021-36742",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-36742.json",
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}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.