H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header
Published Dec 22, 2017
7.5
HIGHCVSS 3.1
EPSS 3.53%
Description
H2O version 2.2.2 and earlier allows remote attackers to cause a denial of service in the server via specially crafted HTTP/1 header.
Affected products
-
- Version version 2.2.2 and earlierStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Kazuho Oku | H2O | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v5
Table of values (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.53% (0.03534) | 88.88th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.47% (0.03467) | 87.50th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.10% (0.00105) | 43.23th | v3 (v2023.03.01) |
| Jun 17, 2024 | 0.10% (0.00105) | 42.97th | v3 (v2023.03.01) |
| Feb 17, 2024 | 0.10% (0.00098) | 39.29th | v3 (v2023.03.01) |
| Dec 2, 2023 | 0.11% (0.00107) | 43.03th | v3 (v2023.03.01) |
| Nov 1, 2023 | 0.10% (0.00099) | 40.68th | v3 (v2023.03.01) |
| May 8, 2023 | 0.09% (0.00086) | 35.02th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00072) | 29.47th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.98% (0.00976) | 26.54th | v1 |
| Jan 6, 2022 | 0.98% (0.00976) | 25.91th | v1 |
| Sep 1, 2021 | 0.98% (0.00976) | 61.78th | v1 |
| Apr 14, 2021 | 0.98% (0.00976) | 0.00th | v1 |
References (2)
- https://github.com/h2o/h2o/issues/1459 x_refsource_CONFIRMThird Party Advisory
- https://jvn.jp/en/jp/JVN84182676/index.html third-party-advisoryx_refsource_JVNThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| https://github.com/h2o/h2o/issues/1459 | x_refsource_CONFIRMThird Party Advisory | |
| https://jvn.jp/en/jp/JVN84182676/index.html | third-party-advisoryx_refsource_JVNThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.