CVE-2017-10908 Denial of service in H2O

What is CVE-2017-10908?

CVE-2017-10908 is a high-severity denial of service vulnerability in Kazuho Oku H2O, published on 22 Dec 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.

Weakness: CWE-20

Which versions are affected by CVE-2017-10908?

It affects 1 product.

Products include Dena H2o.

How do I fix CVE-2017-10908?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-10908 being exploited?

There is no known exploitation of CVE-2017-10908 in the wild and no public exploit code.

Other vulnerabilities in Kazuho Oku H2O

• CVE-2018-0608 Memory corruption in H2O Critical 9.8
• CVE-2016-7835 Use after free in H2O Critical 9.1
• CVE-2023-30847 H2O vulnerable to read from uninitialized pointer in the reverse proxy handler High 8.2
• CVE-2017-10868 Denial of service in H2O High 7.5
• CVE-2017-10869 Memory corruption in H2O High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2017-10908, GHSA-hcqf-mq24-hm46.