What’s Vulnerable › Vulnerabilities

CVE-2017-10868

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-12-22 · updated 2026-06-17
• Weakness: CWE-20

Description

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

• h2o: before 2.2.3 — fixed in 2.2.3

How to fix

Upgrade to a fixed version: h2o 2.2.3. Check the vendor advisory for mitigations.

References

• https://github.com/h2o/h2o/issues/1459
• https://jvn.jp/en/jp/JVN84182676/index.html
• https://github.com/h2o/h2o/issues/1459
• https://jvn.jp/en/jp/JVN84182676/index.html

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