Is CVE-2016-4817 actively exploited?

CVE-2016-4817 has no public evidence of in-the-wild exploitation as of 2025-04-12.

What is the CVSS score for CVE-2016-4817?

CVE-2016-4817 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2016-4817?

Patch guidance is available from dena security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2016-4817.

Which products are affected by CVE-2016-4817?

2 products: dena h2o, dena h2o.

Fix CVE-2016-4817 - HIGH dena h2o

Description

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.

CVSS Metrics

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: NVD-CWE-Other

Metadata

Primary Vendor: DENA
Published: 6/19/2016
Last Modified: 4/12/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

dena : h2odena : h2o

Remediation Guidance

Executive Summary

Cite this page

CVE-2016-4817. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2016-4817

View on NIST NVD

CVE-2016-4817 vulnerability