H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy
Published May 12, 2017
7.5
HIGHCVSS 3.0
EPSS 1.80%
Description
H2O versions 2.0.3 and earlier and 2.1.0-beta2 and earlier allows remote attackers to cause a denial-of-service (DoS) via format string specifiers in a template file via fastcgi, mruby, proxy, redirect or reproxy.
Affected products
-
- Version versions 2.0.3 and earlierStatusaffectedConstraints-
- Version versions 2.1.0-beta2 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.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.80% (0.01802) | 77.71th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.80% (0.01802) | 75.59th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.60% (0.01598) | 80.42th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.14% (0.00139) | 51.00th | v3 (v2023.03.01) |
| May 8, 2023 | 0.14% (0.00139) | 47.95th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00121) | 44.70th | 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) |
References (2)
- https://github.com/h2o/h2o/issues/1077 x_refsource_CONFIRMPatchThird Party Advisory
- https://jvn.jp/en/jp/JVN94779084/index.html third-party-advisoryx_refsource_JVNThird Party AdvisoryVDB Entry
| Link | Providers | Tags |
|---|---|---|
| https://github.com/h2o/h2o/issues/1077 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://jvn.jp/en/jp/JVN94779084/index.html | third-party-advisoryx_refsource_JVNThird Party AdvisoryVDB Entry |
Change history (0)
No recorded changes yet.