CVE-2016-4817

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-06-19 · updated 2026-06-17

Description

lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.

Affected products

h2o: through 1.7.2; through 2.0.0

References

http://jvn.jp/en/jp/JVN87859762/index.html
http://jvndb.jvn.jp/jvndb/JVNDB-2016-000091
https://github.com/h2o/h2o/commit/1c0808d580da09fdec5a9a74ff09e103ea058dd4
https://github.com/h2o/h2o/pull/920
http://jvn.jp/en/jp/JVN87859762/index.html
http://jvndb.jvn.jp/jvndb/JVNDB-2016-000091
https://github.com/h2o/h2o/commit/1c0808d580da09fdec5a9a74ff09e103ea058dd4
https://github.com/h2o/h2o/pull/920

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