What is CVE-2020-1887?

CVE-2020-1887 is a critical-severity vulnerability in Facebook Osquery, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 9.1/10. Published 2020-03-13.

How severe is CVE-2020-1887?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Facebook Osquery

CVE-2020-1887

Incorrect validation of the TLS SNI hostname in osquery versions after 2.9.0 and before 4.2.0 could allow an attacker to MITM osquery traffic in the absence of a configured root chain of trust.

Published 2020-03-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.016 (75.0th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.0% 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

Facebook Osquery — versions 4.2.0, next of 2.9.0, 2.9.0
Linuxfoundation Osquery

Weakness classification (CWE)

References

github.com/osquery/osquery/pull/6197 (Patch, Third Party Advisory)
www.facebook.com/security/advisories/cve-2020-1887 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-1887?: CVE-2020-1887 is a critical-severity vulnerability in Facebook Osquery, classified under Improper Validation of Certificate with Host Mismatch. CVSS score: 9.1/10. Published 2020-03-13.
How severe is CVE-2020-1887?: Critical severity. CVSS v3 base score is 9.1 out of 10.