CVE-2016-4817 json
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 cau…
published 2016-06-19 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-5799
- cvss
- 7.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.4%
- EPSS 4.4% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/h2o/h2o@1c0808d commit
- github.com/h2o/h2o#920 pull request
Exploit prediction
4.45% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
References
- github.com /h2o/h2o/commit/1c0808d580da09fdec5a9a74ff09e103ea058dd4
-
github.com
/h2o/h2o/pull/920
vendor-advisory
-
jvn.jp
/en/jp/JVN87859762/index.html
third-party-advisory, vendor-advisory
-
jvndb.jvn.jp
/jvndb/JVNDB-2016-000091
third-party-advisory, vendor-advisory
Sources
- CVE List CVE-2016-4817
- NVD CVE-2016-4817
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