What is CVE-2020-28578?

CVE-2020-28578 is a critical-severity vulnerability in Trend Micro Interscan Web Security Virtual Appliance, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-11-18.

How severe is CVE-2020-28578?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Trend Micro Interscan Web Security Virtual Appliance

CVE-2020-28578

A vulnerability in Trend Micro InterScan Web Security Virtual Appliance 6.5 SP2 could allow an unauthenticated, remote attacker to send a specially crafted HTTP message and achieve remote code execution with elevated privileges.

Vulnerability class: Buffer Overflow

Published 2020-11-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.730 (99.5th percentile), scored 2026-10-16.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.730 · newest: 0.730 · change: 0.000

Affected products

Trend Micro Interscan Web Security Virtual Appliance — versions 6.5 SP2
Trendmicro Interscan Web Security Virtual Appliance — versions 6.5

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

success.trendmicro.com/solution/000281954 (Vendor Advisory)
www.tenable.com/security/research/tra-2020-63 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28578?: CVE-2020-28578 is a critical-severity vulnerability in Trend Micro Interscan Web Security Virtual Appliance, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-11-18.
How severe is CVE-2020-28578?: Critical severity. CVSS v3 base score is 9.8 out of 10.