lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet
Published Jun 19, 2016
7.5
HIGHCVSS 3.0
EPSS 4.45%
Description
lib/http2/connection.c in H2O before 1.7.3 and 2.x before 2.0.0-beta5 mishandles HTTP/2 disconnection, which allows remote attackers to cause a denial of service (use-after-free and application crash) or possibly execute arbitrary code via a crafted packet.
Affected products
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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.45% (0.04448) | 91.11th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.45% (0.04448) | 90.15th | v5 (v2026.06.15) |
| Mar 30, 2025 | 7.52% (0.07518) | 90.97th | v4 (v2025.03.14) |
| Mar 29, 2025 | 18.96% (0.18965) | 92.31th | v4 (v2025.03.14) |
| Mar 17, 2025 | 7.52% (0.07518) | 91.16th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.23% (0.01225) | 85.99th | v3 (v2023.03.01) |
| May 2, 2024 | 1.23% (0.01225) | 85.20th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.23% (0.01225) | 83.19th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.79% (0.03795) | 85.54th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.79% (0.03795) | 84.06th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.79% (0.03795) | 67.25th | v2 (v2022.01.01) |
No CWE recorded.
References (4)
- http://jvn.jp/en/jp/JVN87859762/index.html third-party-advisoryx_refsource_JVNVendor Advisory
- http://jvndb.jvn.jp/jvndb/JVNDB-2016-000091 third-party-advisoryx_refsource_JVNDBVendor Advisory
- https://github.com/h2o/h2o/commit/1c0808d580da09fdec5a9a74ff09e103ea058dd4 x_refsource_CONFIRM
- https://github.com/h2o/h2o/pull/920 x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://jvn.jp/en/jp/JVN87859762/index.html | third-party-advisoryx_refsource_JVNVendor Advisory | |
| http://jvndb.jvn.jp/jvndb/JVNDB-2016-000091 | third-party-advisoryx_refsource_JVNDBVendor Advisory | |
| https://github.com/h2o/h2o/commit/1c0808d580da09fdec5a9a74ff09e103ea058dd4 | x_refsource_CONFIRM | |
| https://github.com/h2o/h2o/pull/920 | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.