CVE-2016-4979
7.5
HIGH
CVSS 3.1
EPSS 27.6%
Description
The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
How to fix CVE-2016-4979
To remediate CVE-2016-4979, upgrade the affected package to a fixed version below.
- —upgrade to 2.4.23-1 or later
Is CVE-2016-4979 being exploited?
Moderate — EPSS is 27.6%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (1)
- from 0, < 2.4.23-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |