CVE-2021-4138

medium

Description

Improved Host header checks to reject requests not sent to a well-known local hostname or IP, or the server-specified hostname.

References

Advisories

https://github.com/mozilla/geckodriver/releases/tag/v0.30.0

https://bugzilla.mozilla.org/show_bug.cgi?id=1652612

Details

Source: Mitre, NVD

Published: 2022-05-02

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Severity: Medium

EPSS

EPSS: 0.0009