Denial-of-Service Vulnerability in H2O Web Server by H2O
CVE-2016-4864

7.5HIGH

Key Information:

Vendor

Kazuho Oku

Status
H2o
Vendor
CVE Published:
12 May 2017

What is CVE-2016-4864?

H2O Web Server versions 2.0.3 and prior, as well as 2.1.0-beta2 and earlier, contain a vulnerability that allows remote attackers to exploit format string specifiers in template files. This can lead to denial-of-service conditions via mechanisms such as fastcgi, mruby, proxy, redirect, or reproxy, effectively incapacitating the server and disrupting service availability.

Affected Version(s)

H2O versions 2.0.3 and earlier

H2O versions 2.1.0-beta2 and earlier

References

https://github.com/h2o/h2o/issues/1077
x_refsource_CONFIRM
https://jvn.jp/en/jp/JVN94779084/index.html
third-party-advisoryx_refsource_JVN

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.