Is CVE-2016-1133 actively exploited?

CVE-2016-1133 has no public evidence of in-the-wild exploitation as of 2025-04-12.

What is the CVSS score for CVE-2016-1133?

CVE-2016-1133 has a CVSS score of 3.7 (LOW severity). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.

How do I patch CVE-2016-1133?

Patch guidance is available from dena security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2016-1133.

Which products are affected by CVE-2016-1133?

2 products: dena h2o, dena h2o.

CVE-2016-1133 - remediation guidance & executive summary

Description

CRLF injection vulnerability in the on_req function in lib/handler/redirect.c in H2O before 1.6.2 and 1.7.x before 1.7.0-beta3 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a crafted URI.

CVSS Metrics

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

Metadata

Primary Vendor: DENA
Published: 1/16/2016
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-2016-1133. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2016-1133

View on NIST NVD

CVE-2016-1133 vulnerability