What is CVE-2016-7835?

CVE-2016-7835 is a critical-severity vulnerability in Dena H2o, classified under Use After Free. CVSS score: 9.1/10. Published 2017-06-09.

How severe is CVE-2016-7835?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Use After Free in Dena H2o

CVE-2016-7835

Use-after-free vulnerability in H2O allows remote attackers to cause a denial-of-service (DoS) or obtain server certificate private keys and possibly other information.

Vulnerability class: Use-After-Free

Published 2017-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.022 (82.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Dena H2o
H2o Project — versions 2.1.0
Kazuho Oku H2o — versions version 2.0.4 and earlier

Weakness classification (CWE)

CWE-416 — Use After Free

References

www.securityfocus.com/bid/95061 (VDB Entry, Third Party Advisory, vdb-entry)
github.com/h2o/h2o/issues/1144 (Patch, Third Party Advisory)
jvn.jp/en/jp/JVN44566208/index.html (VDB Entry, Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2016-7835?: CVE-2016-7835 is a critical-severity vulnerability in Dena H2o, classified under Use After Free. CVSS score: 9.1/10. Published 2017-06-09.
How severe is CVE-2016-7835?: Critical severity. CVSS v3 base score is 9.1 out of 10.