9.8

CVE-2018-0608: dena h2o

Modified
AliasesUBUNTU-CVE-2018-0608DEBIAN-CVE-2018-0608
Published 26-06-2018Last modified 05-08-2024

Vulnerability summary

CVE-2018-0608 is a critical (CVSS 9.8) vulnerability in dena h2o. EPSS estimates a 3.73% chance of exploitation in the next 30 days, higher than 89.8% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
3.73%
0%100%
Low · -0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 26-06-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

Buffer overflow in H2O version 2.2.4 and earlier allows remote attackers to execute arbitrary code or cause a denial of service (DoS) via unspecified vectors.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

3.73%

Chance of exploitation in the next 30 days

Percentile

90%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 3.78% 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< 2.2.5+dfsg1-1
Dena1 product
Kazuho oku1 product
  • h2oversion 2.2.4 and earlier
Ubuntu1 product
  • h2oAll versions (No fix recorded)

4 vendors · 4 products

References

5 links