No exploitation reportedFix available

CVE-2020-1887

Q: Is CVE-2020-1887 actively exploited?

Active exploitation of CVE-2020-1887 has not been confirmed. Its EPSS score was 1.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-1887?

CVE-2020-1887 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

No exploitation reported by the sources we read.

Published2020-03-13
Fixed in4.2.0
WeaknessCWE-295 · CWE-297

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2020-03-1300:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-1887?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-1887?format=csv
TAXII collection of exploited CVEs
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Versions per branch

NVD

Linuxfoundation osquery

Branch	Affected	Fixed in	Source
4.2	> 2.9.0, < 4.2.0	4.2.0	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Linuxfoundation osquery to 4.2.0

Advisories and patches

github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.1read 2026-10-23
NVDCVSS 2.05.8read 2026-10-23
CNAweakness (CWE)CWE-297read 2026-10-23
NVDweakness (CWE)CWE-295read 2026-10-23
FIRST EPSSEPSS score1.6 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2020-03-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is 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.

Is CVE-2020-1887 actively exploited?

Active exploitation of CVE-2020-1887 has not been confirmed. Its EPSS score was 1.6% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-1887?

CVE-2020-1887 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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