7.5

CVE-2017-10908: dena h2o Improper Input Validation

Modified
AliasesUBUNTU-CVE-2017-10908DEBIAN-CVE-2017-10908
Published 22-12-2017Last modified 05-08-2024

Vulnerability summary

CVE-2017-10908 is a high (CVSS 7.5) Improper Input Validation vulnerability in dena h2o. EPSS estimates a 3.64% chance of exploitation in the next 30 days, higher than 89.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
3.64%
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. 22-12-2017
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

H2O version 2.2.3 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/2 header.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

3.64%

Chance of exploitation in the next 30 days

Percentile

90%

Versus all other CVEs

30-day change

No change 0.00 pp

From 3.64% 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.

Debian1 product
  • h2o< 2.2.4+dfsg-1
Dena1 product
Kazuho oku1 product
  • h2oversion 2.2.3 and earlier
Ubuntu1 product
  • h2o< 2.2.4+dfsg-1build1

4 vendors · 4 products

References

5 links