THREATPORT/VULNERABILITY/CVE-2016-4817
HIGH SEVERITY

CVE-2016-4817

H2o vulnerability

CVSS
7.5
EPSS
4.4%
EPSS pct
90th
Exploited
No known
lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.
Affected vendor
Dena
Affected product
H2o
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2016-06-19

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 availability.

Its EPSS score of 4.4% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2016-4817

  • Confirm whether Dena H2o is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2016-4817.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-4817

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-4817 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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