Client DoS due to large DH parameter
Published Jun 12, 2018
7.5
HIGHCVSS 3.1
EPSS 48.83%
Description
During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack. Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h). Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o).
Affected products
-
- Version Fixed in OpenSSL 1.0.2p-dev (Affected 1.0.2-1.0.2o)StatusaffectedConstraints-
- Version Fixed in OpenSSL 1.1.0i-dev (Affected 1.1.0-1.1.0h)StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
Configuration 1
Configuration 2
- 12.04
- 14.04
- 16.04
- 17.10
- 18.04
- 8.0
No data.
JBoss Core Services Apache HTTP Server 2.4.29 SP2
n/a
Fixed · RHSA-2019:1296
JBoss Core Services Apache HTTP Server 2.4.29 SP2
openssl
Fixed · RHSA-2019:1543
JBoss Core Services on RHEL 6
jbcs-httpd24-httpd-0:2.4.29-40.jbcs.el6
Fixed · RHSA-2019:1297
JBoss Core Services on RHEL 6
jbcs-httpd24-openssl-1:1.0.2n-15.jbcs.el6
Fixed · RHSA-2019:1297
JBoss Core Services on RHEL 7
jbcs-httpd24-httpd-0:2.4.29-40.jbcs.el7
Fixed · RHSA-2019:1297
JBoss Core Services on RHEL 7
jbcs-httpd24-openssl-1:1.0.2n-15.jbcs.el7
Fixed · RHSA-2019:1297
Red Hat Enterprise Linux 7
openssl-1:1.0.2k-16.el7
Fixed · RHSA-2018:3221
Red Hat OpenShift Application Runtimes Node.js 10
rhoar-nodejs-1:10.9.0-1.el7
Fixed · RHSA-2018:2553
Red Hat OpenShift Application Runtimes Node.js 8
rhoar-nodejs-1:8.11.4-2.el7
Fixed · RHSA-2018:2552
Red Hat Enterprise Linux 5
openssl
Will not fix
Red Hat Enterprise Linux 5
openssl097a
Will not fix
Red Hat Enterprise Linux 6
openssl
Will not fix
Red Hat Enterprise Linux 6
openssl098e
Will not fix
Red Hat Enterprise Linux 7
OVMF
Will not fix
Red Hat Enterprise Linux 7
openssl098e
Will not fix
Red Hat Enterprise Linux 8
openssl
Not affected
Red Hat JBoss Enterprise Application Platform 5
openssl
Out of support scope
Red Hat JBoss Enterprise Application Platform 6
openssl
Will not fix
Red Hat JBoss Enterprise Web Server 2
openssl
Will not fix
Red Hat JBoss Web Server 3
openssl
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| JBoss Core Services Apache HTTP Server 2.4.29 SP2 | n/a | Fixed | RHSA-2019:1296 |
| JBoss Core Services Apache HTTP Server 2.4.29 SP2 | openssl | Fixed | RHSA-2019:1543 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-httpd-0:2.4.29-40.jbcs.el6 | Fixed | RHSA-2019:1297 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-openssl-1:1.0.2n-15.jbcs.el6 | Fixed | RHSA-2019:1297 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-httpd-0:2.4.29-40.jbcs.el7 | Fixed | RHSA-2019:1297 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-openssl-1:1.0.2n-15.jbcs.el7 | Fixed | RHSA-2019:1297 |
| Red Hat Enterprise Linux 7 | openssl-1:1.0.2k-16.el7 | Fixed | RHSA-2018:3221 |
| Red Hat OpenShift Application Runtimes Node.js 10 | rhoar-nodejs-1:10.9.0-1.el7 | Fixed | RHSA-2018:2553 |
| Red Hat OpenShift Application Runtimes Node.js 8 | rhoar-nodejs-1:8.11.4-2.el7 | Fixed | RHSA-2018:2552 |
| Red Hat Enterprise Linux 5 | openssl | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | openssl097a | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | openssl | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | OVMF | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | openssl | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | openssl | Out of support scope | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | openssl | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 2 | openssl | Will not fix | n/a |
| Red Hat JBoss Web Server 3 | openssl | Affected | n/a |
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
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
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 v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (57 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 48.83% (0.48831) | 98.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 49.27% (0.49268) | 98.73th | v5 (v2026.06.15) |
| Mar 24, 2026 | 78.59% (0.78589) | 99.02th | v4 (v2025.03.14) |
| Mar 18, 2026 | 79.77% (0.79773) | 99.08th | v4 (v2025.03.14) |
| Mar 17, 2026 | 81.09% (0.81092) | 99.14th | v4 (v2025.03.14) |
| Mar 4, 2026 | 79.40% (0.79399) | 99.05th | v4 (v2025.03.14) |
| Mar 1, 2026 | 56.01% (0.56009) | 98.06th | v4 (v2025.03.14) |
| Feb 18, 2026 | 79.40% (0.79399) | 99.05th | v4 (v2025.03.14) |
| Feb 4, 2026 | 81.09% (0.81092) | 99.13th | v4 (v2025.03.14) |
| Feb 1, 2026 | 59.46% (0.59460) | 98.20th | v4 (v2025.03.14) |
| Jan 4, 2026 | 81.09% (0.81092) | 99.12th | v4 (v2025.03.14) |
| Jan 1, 2026 | 59.46% (0.59460) | 98.17th | v4 (v2025.03.14) |
| Dec 28, 2025 | 81.09% (0.81092) | 99.12th | v4 (v2025.03.14) |
| Dec 27, 2025 | 77.94% (0.77935) | 98.97th | v4 (v2025.03.14) |
| Dec 4, 2025 | 81.09% (0.81092) | 99.10th | v4 (v2025.03.14) |
| Dec 1, 2025 | 59.46% (0.59460) | 98.16th | v4 (v2025.03.14) |
| Nov 21, 2025 | 81.09% (0.81092) | 99.10th | v4 (v2025.03.14) |
| Nov 18, 2025 | 43.04% (0.43037) | 97.34th | v4 (v2025.03.14) |
| Nov 4, 2025 | 81.09% (0.81092) | 99.10th | v4 (v2025.03.14) |
| Nov 1, 2025 | 59.46% (0.59460) | 98.15th | v4 (v2025.03.14) |
| Oct 28, 2025 | 81.09% (0.81092) | 99.11th | v4 (v2025.03.14) |
| Oct 27, 2025 | 77.94% (0.77935) | 98.96th | v4 (v2025.03.14) |
| Oct 4, 2025 | 81.09% (0.81092) | 99.12th | v4 (v2025.03.14) |
| Oct 1, 2025 | 59.46% (0.59460) | 98.20th | v4 (v2025.03.14) |
| Sep 6, 2025 | 77.94% (0.77935) | 98.97th | v4 (v2025.03.14) |
| Sep 1, 2025 | 50.93% (0.50927) | 97.80th | v4 (v2025.03.14) |
| Aug 4, 2025 | 77.94% (0.77935) | 98.96th | v4 (v2025.03.14) |
| Aug 1, 2025 | 50.93% (0.50927) | 97.78th | v4 (v2025.03.14) |
| Jul 30, 2025 | 77.94% (0.77935) | 98.95th | v4 (v2025.03.14) |
| Jul 4, 2025 | 81.09% (0.81092) | 99.10th | v4 (v2025.03.14) |
| Jul 1, 2025 | 59.46% (0.59460) | 98.13th | v4 (v2025.03.14) |
| Jun 4, 2025 | 81.09% (0.81092) | 99.10th | v4 (v2025.03.14) |
| Jun 1, 2025 | 59.46% (0.59460) | 98.11th | v4 (v2025.03.14) |
| May 4, 2025 | 81.09% (0.81092) | 99.09th | v4 (v2025.03.14) |
| May 1, 2025 | 59.46% (0.59460) | 98.11th | v4 (v2025.03.14) |
| Mar 30, 2025 | 81.09% (0.81092) | 99.11th | v4 (v2025.03.14) |
| Mar 29, 2025 | 70.64% (0.70639) | 98.24th | v4 (v2025.03.14) |
| Mar 17, 2025 | 81.27% (0.81269) | 99.13th | v4 (v2025.03.14) |
| Dec 12, 2024 | 4.79% (0.04791) | 93.01th | v3 (v2023.03.01) |
| Jun 27, 2024 | 4.23% (0.04232) | 92.33th | v3 (v2023.03.01) |
| Mar 27, 2024 | 4.97% (0.04973) | 92.66th | v3 (v2023.03.01) |
| Jan 30, 2024 | 3.81% (0.03809) | 91.01th | v3 (v2023.03.01) |
| Dec 13, 2023 | 4.67% (0.04670) | 91.73th | v3 (v2023.03.01) |
| Nov 8, 2023 | 5.44% (0.05439) | 92.34th | v3 (v2023.03.01) |
| Nov 3, 2023 | 6.83% (0.06828) | 93.14th | v3 (v2023.03.01) |
| Sep 4, 2023 | 8.95% (0.08953) | 93.81th | v3 (v2023.03.01) |
| Jun 6, 2023 | 10.03% (0.10032) | 94.02th | v3 (v2023.03.01) |
| May 8, 2023 | 11.85% (0.11849) | 94.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 10.87% (0.10873) | 94.14th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.72% (0.04720) | 89.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 4.72% (0.04720) | 88.14th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.72% (0.04720) | 74.52th | v2 (v2022.01.01) |
| Feb 3, 2022 | 9.18% (0.09179) | 86.60th | v1 |
| Jan 6, 2022 | 9.18% (0.09179) | 86.44th | v1 |
| Sep 1, 2021 | 9.18% (0.09179) | 93.82th | v1 |
| Jun 9, 2021 | 9.18% (0.09179) | 0.00th | v1 |
| Apr 14, 2021 | 8.96% (0.08957) | 0.00th | v1 |
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Change history (0)
No recorded changes yet.