Medium severity · published May 2, 2022
CVE-2021-4138
Improved Host header checks to reject requests not sent to a well-known local hostname or IP, or the server-specified hostname
5.3
CVSS
0.8%
EPSS
No
On KEV
Description
Improved Host header checks to reject requests not sent to a well-known local hostname or IP, or the server-specified hostname.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 58% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GE
Geckodriver · Mozilla
before 0.30.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4138
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-4138
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1652612
Release Notes
https://github.com/mozilla/geckodriver/releases/tag/v0.30.0
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