LOW
CVE-2016-1133
NVD-CWE-OtherPublished: January 16, 2016· Updated: Jun 17, 2026
3.7
CVSS v3.1
Official 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.
Technical Analysis
CVE-2016-1133 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected Vendors & Products
dena1 product(s)
h2o
Source: NVD CPE · 2 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
http://jvn.jp/en/jp/JVN45928828/index.htmlVendor Advisory
→
http://jvndb.jvn.jp/jvndb/JVNDB-2016-000003Vendor Advisory
→
http://jvn.jp/en/jp/JVN45928828/index.htmlVendor Advisory
→
http://jvndb.jvn.jp/jvndb/JVNDB-2016-000003Vendor Advisory
Quick Facts
CVE IDCVE-2016-1133
CVSS Score3.7 / 10
SeverityLOW
WeaknessNVD-CWE-Other
CISA KEVNo
Affected1 vendor(s)
PublishedJan 16, 2016
Related CVEs (NVD-CWE-Other)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2016-1133 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.