9.1

CVE-2016-7835: dena h2o Use After Free

Modified
Published 09-06-2017Last modified 06-08-2024

Vulnerability summary

CVE-2016-7835 is a critical (CVSS 9.1) Use After Free vulnerability in dena h2o. EPSS estimates a 2.23% chance of exploitation in the next 30 days, higher than 82.7% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.1 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.1/10
010
Critical · v3.0 (NVD)
EPSS score
2.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 09-06-2017
    PublishedVulnerability first disclosed.
  2. 06-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

2.23%

Chance of exploitation in the next 30 days

Percentile

83%

Versus all other CVEs

30-day change

No change 0.00 pp

From 2.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Dena1 product
H2o_project1 product
Kazuho oku1 product
  • h2oversion 2.0.4 and earlier

3 vendors · 3 products

References

3 links