CVE-2016-4817

7.5 highEPSS 4.4%

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.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 4.4% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
Published: 2016-06-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

dena:h2o

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

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