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Vulnerability record · CVE-2021-31520 · published 10 May 2021

CVE-2021-31520: Trendmicro im security improper authentication vulnerability

Trendmicro · Im Security

A weak session token authentication bypass vulnerability in Trend Micro IM Security 1.6 and 1.6.5 could allow an remote attacker to guess currently logged-in administrators' session session token in order to gain access to the product's web management interface.

8.1 CVSS 3.1 High EPSS 3.9% · top 10.1% CWE-287 · Improper authentication
8.1CVSS 3.1 base score, v2 6.8
3.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

A weak session token authentication bypass vulnerability in Trend Micro IM Security 1.6 and 1.6.5 could allow an remote attacker to guess currently logged-in administrators' session session token in order to gain access to the product's web management interface.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://success.trendmicro.com/solution/000286439 PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-525/ Third Party AdvisoryVDB Entry
https://success.trendmicro.com/solution/000286439 PatchVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-525/ Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-31520), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.