What is CVE-2019-20866?

CVE-2019-20866 is a medium-severity vulnerability in Mattermost Server, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2020-06-19.

How severe is CVE-2019-20866?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mattermost Server

CVE-2019-20866

An issue was discovered in Mattermost Server before 5.12.0. Use of a Proxy HTTP header, rather than the source address in an IP packet header, for obtaining IP address information was mishandled.

Vulnerability class: HTTP Request Smuggling

EPSS: 0.009 (56.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

Affected products

Mattermost Mattermost_server
N/a — versions n/a

Weakness classification (CWE)

CWE-444 — Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling)

References

cve@mitre.org (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2019-20866?: CVE-2019-20866 is a medium-severity vulnerability in Mattermost Server, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.3/10. Published 2020-06-19.
How severe is CVE-2019-20866?: Medium severity. CVSS v3 base score is 5.3 out of 10.