What is CVE-2020-15604?

CVE-2020-15604 is a high-severity vulnerability in Microsoft Windows, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2020-09-24.

How severe is CVE-2020-15604?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Microsoft Windows

CVE-2020-15604

An incomplete SSL server certification validation vulnerability in the Trend Micro Security 2019 (v15) consumer family of products could allow an attacker to combine this vulnerability with another attack to trick an affected client into downloading a malicious update instead of the expected one. CWE-494: Update files are not properly verified.

Vulnerability class: Improper Certificate Validation

Published 2020-09-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.016 (75.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Microsoft Windows
Trend Micro Security (Consumer) — versions 2019 (v15)
Trendmicro Antivirus\+ 2019
Trendmicro Internet Security 2019
Trendmicro Maximum Security 2019
Trendmicro Officescan Cloud — versions 15
Trendmicro Premium Security 2019

Weakness classification (CWE)

References

helpcenter.trendmicro.com/en-us/article/TMKA-09890 (Vendor Advisory)
helpcenter.trendmicro.com/ja-jp/article/TMKA-09673 (Vendor Advisory)
jvn.jp/en/jp/JVN60093979/ (Third Party Advisory)
jvn.jp/jp/JVN60093979/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-15604?: CVE-2020-15604 is a high-severity vulnerability in Microsoft Windows, classified under Improper Certificate Validation. CVSS score: 7.5/10. Published 2020-09-24.
How severe is CVE-2020-15604?: High severity. CVSS v3 base score is 7.5 out of 10.