CVE-2017-10868: Dena h2o

High severity, CVSS 7.5. EPSS: 3.5% chance of exploitation in the next 30 days.

H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header.

Affected products

• Dena h2o: before 2.2.3 (fixed in 2.2.3)

Published 2017-12-22. Last modified 2026-06-17.