Description
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
Scores
CVSS v3
7.5
EPSS
0.0160
EPSS Percentile
81.8%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-134
Status
published
Products (4)
dena/h2o
2.1.0 (2 CPE variants)
dena/h2o
2.0.0 - 2.0.3
Kazuho Oku/H2O
versions 2.0.3 and earlier
Kazuho Oku/H2O
versions 2.1.0-beta2 and earlier
Published
May 12, 2017
Tracked Since
Feb 18, 2026