httpd: Padding Oracle in Apache mod_session_crypto
Published Jul 27, 2017
7.5
HIGHCVSS 3.0
EPSS 49.02%
Description
In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.
Affected products
-
- Version 2.4.0 to 2.4.23StatusaffectedConstraints-
- 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 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server | n/a |
|
- 2.4.0
- 2.4.1
- 2.4.2
- 2.4.3
- 2.4.6
- 2.4.7
- 2.4.8
- 2.4.9
- 2.4.10
- 2.4.12
- 2.4.14
- 2.4.16
- 2.4.19
- 2.4.20
- 2.4.21
- 2.4.22
- 2.4.23
No data.
JBoss Core Services on RHEL 6
jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el6
Fixed · RHSA-2017:1414
JBoss Core Services on RHEL 6
jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el6
Fixed · RHSA-2017:1414
JBoss Core Services on RHEL 6
jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6
Fixed · RHSA-2017:1414
JBoss Core Services on RHEL 7
jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el7
Fixed · RHSA-2017:1413
JBoss Core Services on RHEL 7
jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el7
Fixed · RHSA-2017:1413
JBoss Core Services on RHEL 7
jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7
Fixed · RHSA-2017:1413
Red Hat Enterprise Linux 7
httpd-0:2.4.6-45.el7_3.4
Fixed · RHSA-2017:0906
Red Hat JBoss Core Services
n/a
Fixed · RHSA-2017:1415
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-httpd-0:2.4.25-9.el6
Fixed · RHSA-2017:1161
Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
httpd24-httpd-0:2.4.25-9.el6
Fixed · RHSA-2017:1161
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-httpd-0:2.4.25-9.el7
Fixed · RHSA-2017:1161
Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
httpd24-httpd-0:2.4.25-9.el7
Fixed · RHSA-2017:1161
Red Hat Directory Server 8
httpd
Not affected
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 5
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 6
httpd
Not affected
Red Hat JBoss Enterprise Application Platform 6
httpd22
Not affected
Red Hat JBoss Enterprise Web Server 1
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd
Not affected
Red Hat JBoss Enterprise Web Server 2
httpd22
Not affected
Red Hat JBoss Web Server 3
httpd
Fix deferred
Red Hat JBoss Web Server 3
httpd24
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| JBoss Core Services on RHEL 6 | jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el6 | Fixed | RHSA-2017:1414 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el6 | Fixed | RHSA-2017:1414 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el6 | Fixed | RHSA-2017:1414 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-httpd-0:2.4.23-120.jbcs.el7 | Fixed | RHSA-2017:1413 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-mod_security-0:2.9.1-19.GA.jbcs.el7 | Fixed | RHSA-2017:1413 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-openssl-1:1.0.2h-13.jbcs.el7 | Fixed | RHSA-2017:1413 |
| Red Hat Enterprise Linux 7 | httpd-0:2.4.6-45.el7_3.4 | Fixed | RHSA-2017:0906 |
| Red Hat JBoss Core Services | n/a | Fixed | RHSA-2017:1415 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-httpd-0:2.4.25-9.el6 | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS | httpd24-httpd-0:2.4.25-9.el6 | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-httpd-0:2.4.25-9.el7 | Fixed | RHSA-2017:1161 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS | httpd24-httpd-0:2.4.25-9.el7 | Fixed | RHSA-2017:1161 |
| Red Hat Directory Server 8 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | httpd22 | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 1 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | httpd22 | Not affected | n/a |
| Red Hat JBoss Web Server 3 | httpd | Fix deferred | n/a |
| Red Hat JBoss Web Server 3 | httpd24 | Fix deferred | n/a |
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:H/I:N/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
AV:N/AC:L/Au:N/C:P/I:N/A:N
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 (57 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 49.02% (0.49024) | 98.85th | v5 (v2026.06.15) |
| Sep 22, 2026 | 49.02% (0.49024) | 98.83th | v5 (v2026.06.15) |
| Sep 21, 2026 | 46.83% (0.46832) | 98.81th | v5 (v2026.06.15) |
| Sep 6, 2026 | 49.02% (0.49024) | 98.80th | v5 (v2026.06.15) |
| Sep 5, 2026 | 46.83% (0.46832) | 98.78th | v5 (v2026.06.15) |
| Aug 30, 2026 | 49.02% (0.49024) | 98.79th | v5 (v2026.06.15) |
| Aug 28, 2026 | 46.83% (0.46832) | 98.78th | v5 (v2026.06.15) |
| Aug 24, 2026 | 49.02% (0.49024) | 98.79th | v5 (v2026.06.15) |
| Aug 23, 2026 | 46.83% (0.46832) | 98.77th | v5 (v2026.06.15) |
| Jun 15, 2026 | 49.02% (0.49024) | 98.73th | v5 (v2026.06.15) |
| Jun 9, 2026 | 34.28% (0.34285) | 97.09th | v4 (v2025.03.14) |
| Mar 4, 2026 | 41.68% (0.41680) | 97.34th | v4 (v2025.03.14) |
| Mar 1, 2026 | 25.04% (0.25040) | 96.08th | v4 (v2025.03.14) |
| Feb 4, 2026 | 41.68% (0.41680) | 97.31th | v4 (v2025.03.14) |
| Feb 1, 2026 | 25.04% (0.25040) | 96.05th | v4 (v2025.03.14) |
| Jan 4, 2026 | 41.68% (0.41680) | 97.28th | v4 (v2025.03.14) |
| Jan 1, 2026 | 25.04% (0.25040) | 96.03th | v4 (v2025.03.14) |
| Dec 28, 2025 | 41.68% (0.41680) | 97.28th | v4 (v2025.03.14) |
| Dec 27, 2025 | 42.80% (0.42796) | 97.36th | v4 (v2025.03.14) |
| Dec 4, 2025 | 41.68% (0.41680) | 97.26th | v4 (v2025.03.14) |
| Dec 1, 2025 | 17.62% (0.17617) | 94.87th | v4 (v2025.03.14) |
| Nov 4, 2025 | 31.84% (0.31844) | 96.59th | v4 (v2025.03.14) |
| Nov 1, 2025 | 17.62% (0.17617) | 94.85th | v4 (v2025.03.14) |
| Oct 28, 2025 | 31.84% (0.31844) | 96.58th | v4 (v2025.03.14) |
| Oct 27, 2025 | 30.20% (0.30197) | 96.47th | v4 (v2025.03.14) |
| Oct 4, 2025 | 31.84% (0.31844) | 96.65th | v4 (v2025.03.14) |
| Oct 1, 2025 | 17.62% (0.17617) | 94.88th | v4 (v2025.03.14) |
| Sep 27, 2025 | 30.20% (0.30197) | 96.54th | v4 (v2025.03.14) |
| Sep 20, 2025 | 42.40% (0.42399) | 97.37th | v4 (v2025.03.14) |
| Sep 4, 2025 | 17.41% (0.17410) | 94.82th | v4 (v2025.03.14) |
| Sep 1, 2025 | 10.25% (0.10249) | 92.91th | v4 (v2025.03.14) |
| Aug 4, 2025 | 17.41% (0.17410) | 94.79th | v4 (v2025.03.14) |
| Aug 1, 2025 | 10.25% (0.10249) | 92.89th | v4 (v2025.03.14) |
| Jul 30, 2025 | 17.41% (0.17410) | 94.78th | v4 (v2025.03.14) |
| Jul 4, 2025 | 18.59% (0.18590) | 94.96th | v4 (v2025.03.14) |
| Jul 1, 2025 | 11.02% (0.11024) | 93.15th | v4 (v2025.03.14) |
| Jun 4, 2025 | 18.59% (0.18590) | 94.91th | v4 (v2025.03.14) |
| Jun 1, 2025 | 11.02% (0.11024) | 93.10th | v4 (v2025.03.14) |
| May 30, 2025 | 18.59% (0.18590) | 94.90th | v4 (v2025.03.14) |
| May 16, 2025 | 10.57% (0.10567) | 92.85th | v4 (v2025.03.14) |
| May 15, 2025 | 12.18% (0.12184) | 93.44th | v4 (v2025.03.14) |
| May 4, 2025 | 10.57% (0.10567) | 92.83th | v4 (v2025.03.14) |
| May 1, 2025 | 6.32% (0.06318) | 90.46th | v4 (v2025.03.14) |
| Apr 12, 2025 | 10.57% (0.10567) | 92.58th | v4 (v2025.03.14) |
| Mar 30, 2025 | 18.59% (0.18590) | 94.75th | v4 (v2025.03.14) |
| Mar 29, 2025 | 33.38% (0.33379) | 95.20th | v4 (v2025.03.14) |
| Mar 17, 2025 | 18.59% (0.18590) | 94.76th | v4 (v2025.03.14) |
| Dec 17, 2024 | 2.77% (0.02765) | 90.31th | v3 (v2023.03.01) |
| Dec 12, 2024 | 1.10% (0.01098) | 85.06th | v3 (v2023.03.01) |
| Jul 4, 2024 | 1.23% (0.01234) | 85.51th | v3 (v2023.03.01) |
| Jan 21, 2024 | 1.10% (0.01098) | 82.86th | v3 (v2023.03.01) |
| Oct 31, 2023 | 1.32% (0.01320) | 84.50th | v3 (v2023.03.01) |
| Aug 12, 2023 | 0.97% (0.00967) | 81.37th | v3 (v2023.03.01) |
| Jul 7, 2023 | 1.19% (0.01194) | 83.23th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.93% (0.00934) | 80.62th | v3 (v2023.03.01) |
| Mar 6, 2023 | 43.52% (0.43518) | 98.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 43.52% (0.43518) | 97.65th | v2 (v2022.01.01) |
References (33)
- http://rhn.redhat.com/errata/RHSA-2017-1415.html vendor-advisoryx_refsource_REDHAT
- http://www.debian.org/security/2017/dsa-3796 vendor-advisoryx_refsource_DEBIAN
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- https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
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- https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
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Change history (0)
No recorded changes yet.