What’s Vulnerable › Vulnerabilities

CVE-2021-31520

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-10 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Trend Micro IM Security: 1.6, 1.6.5

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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