THREATPORT/VULNERABILITY/CVE-2016-4979
HIGH SEVERITY

CVE-2016-4979

Http Server vulnerability

CVSS
7.5
EPSS
18.8%
EPSS pct
97th
Exploited
No known
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.
Affected vendor
Apache
Affected product
Http Server
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness type (CWE)
  • CWE-284 — Improper Access Control
Published
2016-07-06

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 18.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 97% of all scored CVEs.

Check your external exposure to CVE-2016-4979

  • Confirm whether Apache Http Server is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2016-4979.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-4979

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-4979 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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