CVE-2021-31520

8.1 highEPSS 3.9%

High (8.1) in trendmicro im security. EPSS 3.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.1 high

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

EPSS: 3.9% chance of exploitation in the next 30 days; higher than 90% of CVEs (scores of 2026-10-31)
CWE: CWE-287
Published: 2021-05-10
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

trendmicro:im_security

References

https://success.trendmicro.com/solution/000286439
https://www.zerodayinitiative.com/advisories/ZDI-21-525/
https://success.trendmicro.com/solution/000286439
https://www.zerodayinitiative.com/advisories/ZDI-21-525/

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