httpd: Improper handling of headers in mod_session can allow a remote user to modify session data for CGI applications
Published Mar 26, 2018
5.3
MEDIUMCVSS 3.0
EPSS 9.74%
Description
In Apache httpd 2.4.0 to 2.4.29, when mod_session is configured to forward its session data to CGI applications (SessionEnv on, not the default), a remote user may influence their content by using a "Session" header. This comes from the "HTTP_SESSION" variable name used by mod_session to forward its data to CGIs, since the prefix "HTTP_" is also used by the Apache HTTP Server to pass HTTP header fields, per CGI specifications.
Affected products
-
- Version 2.4.0 to 2.4.29StatusaffectedConstraints-
- 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 |
|
Configuration 1
- ≥ 2.4.0 · ≤ 2.4.29
Configuration 2
- 8.0
- 9.0
Configuration 3
- 14.04
- 16.04
- 17.10
- 18.04
Configuration 4
- n/a
- n/a
- n/a
- n/a
Configuration 5
- 6.0
- 7.0
- 7.4
- 7.5
- 7.6
No data.
JBoss Core Services on RHEL 6
jbcs-httpd24-0:1-6.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-apache-commons-daemon-jsvc-1:1.1.0-3.redhat_2.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-apr-0:1.6.3-31.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-apr-util-0:1.6.1-24.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-httpd-0:2.4.29-35.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-mod_cluster-native-0:1.3.8-3.Final_redhat_2.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-mod_jk-0:1.2.46-1.redhat_1.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-nghttp2-0:1.29.0-9.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 6
jbcs-httpd24-openssl-1:1.0.2n-14.jbcs.el6
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-0:1-6.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-apache-commons-daemon-jsvc-1:1.1.0-3.redhat_2.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-apr-0:1.6.3-31.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-apr-util-0:1.6.1-24.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-httpd-0:2.4.29-35.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-mod_cluster-native-0:1.3.8-3.Final_redhat_2.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-mod_jk-0:1.2.46-1.redhat_1.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-nghttp2-0:1.29.0-9.jbcs.el7
Fixed · RHSA-2019:0367
JBoss Core Services on RHEL 7
jbcs-httpd24-openssl-1:1.0.2n-14.jbcs.el7
Fixed · RHSA-2019:0367
Red Hat Enterprise Linux 7
httpd-0:2.4.6-95.el7
Fixed · RHSA-2020:3958
Red Hat JBoss Core Services
httpd
Fixed · RHSA-2019:0366
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-curl-0:7.61.1-1.el6
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-httpd-0:2.4.34-7.el6
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-nghttp2-0:1.7.1-7.el6
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Enterprise Linux 5
httpd
Not affected
Red Hat Enterprise Linux 6
httpd
Not affected
Red Hat Enterprise Linux 8
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 Web Server 2
httpd
Not affected
Red Hat JBoss Web Server 3
httpd
Not affected
Red Hat Mobile Application Platform 4
rhmap-httpd-docker
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| JBoss Core Services on RHEL 6 | jbcs-httpd24-0:1-6.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-apache-commons-daemon-jsvc-1:1.1.0-3.redhat_2.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-apr-0:1.6.3-31.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-apr-util-0:1.6.1-24.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-httpd-0:2.4.29-35.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-mod_cluster-native-0:1.3.8-3.Final_redhat_2.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-mod_jk-0:1.2.46-1.redhat_1.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-nghttp2-0:1.29.0-9.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 6 | jbcs-httpd24-openssl-1:1.0.2n-14.jbcs.el6 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-0:1-6.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-apache-commons-daemon-jsvc-1:1.1.0-3.redhat_2.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-apr-0:1.6.3-31.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-apr-util-0:1.6.1-24.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-httpd-0:2.4.29-35.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-mod_cluster-native-0:1.3.8-3.Final_redhat_2.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-mod_jk-0:1.2.46-1.redhat_1.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-nghttp2-0:1.29.0-9.jbcs.el7 | Fixed | RHSA-2019:0367 |
| JBoss Core Services on RHEL 7 | jbcs-httpd24-openssl-1:1.0.2n-14.jbcs.el7 | Fixed | RHSA-2019:0367 |
| Red Hat Enterprise Linux 7 | httpd-0:2.4.6-95.el7 | Fixed | RHSA-2020:3958 |
| Red Hat JBoss Core Services | httpd | Fixed | RHSA-2019:0366 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-curl-0:7.61.1-1.el6 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-httpd-0:2.4.34-7.el6 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-nghttp2-0:1.7.1-7.el6 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Enterprise Linux 5 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 6 | httpd | Not affected | n/a |
| Red Hat Enterprise Linux 8 | 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 Web Server 2 | httpd | Not affected | n/a |
| Red Hat JBoss Web Server 3 | httpd | Not affected | n/a |
| Red Hat Mobile Application Platform 4 | rhmap-httpd-docker | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of httpd as shipped with Red Hat Enterprise Linux 5 and 6 as they did not include mod_session module.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
AV:N/AC:M/Au:S/C:N/I:P/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
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 (44 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 9.74% (0.09737) | 95.38th | v5 (v2026.06.15) |
| Jun 15, 2026 | 10.12% (0.10118) | 95.03th | v5 (v2026.06.15) |
| Mar 4, 2026 | 2.93% (0.02927) | 86.18th | v4 (v2025.03.14) |
| Mar 1, 2026 | 0.99% (0.00990) | 76.68th | v4 (v2025.03.14) |
| Feb 4, 2026 | 2.93% (0.02927) | 86.07th | v4 (v2025.03.14) |
| Feb 1, 2026 | 1.32% (0.01324) | 79.61th | v4 (v2025.03.14) |
| Jan 4, 2026 | 2.93% (0.02927) | 86.00th | v4 (v2025.03.14) |
| Jan 1, 2026 | 1.32% (0.01324) | 79.55th | v4 (v2025.03.14) |
| Dec 4, 2025 | 2.93% (0.02927) | 85.95th | v4 (v2025.03.14) |
| Dec 1, 2025 | 1.32% (0.01324) | 79.39th | v4 (v2025.03.14) |
| Nov 11, 2025 | 2.93% (0.02927) | 85.91th | v4 (v2025.03.14) |
| Nov 1, 2025 | 1.72% (0.01718) | 81.83th | v4 (v2025.03.14) |
| Oct 4, 2025 | 3.76% (0.03760) | 87.56th | v4 (v2025.03.14) |
| Oct 1, 2025 | 1.72% (0.01718) | 81.77th | v4 (v2025.03.14) |
| Sep 4, 2025 | 4.29% (0.04294) | 88.42th | v4 (v2025.03.14) |
| Sep 1, 2025 | 1.17% (0.01170) | 77.94th | v4 (v2025.03.14) |
| Aug 13, 2025 | 3.62% (0.03620) | 87.35th | v4 (v2025.03.14) |
| Aug 4, 2025 | 2.55% (0.02552) | 84.92th | v4 (v2025.03.14) |
| Aug 1, 2025 | 0.79% (0.00788) | 73.03th | v4 (v2025.03.14) |
| Jul 27, 2025 | 2.23% (0.02228) | 83.82th | v4 (v2025.03.14) |
| Jul 4, 2025 | 3.82% (0.03824) | 87.65th | v4 (v2025.03.14) |
| Jul 1, 2025 | 2.03% (0.02026) | 83.02th | v4 (v2025.03.14) |
| Jun 24, 2025 | 3.82% (0.03824) | 87.62th | v4 (v2025.03.14) |
| Jun 4, 2025 | 5.65% (0.05646) | 89.87th | v4 (v2025.03.14) |
| Jun 1, 2025 | 3.01% (0.03006) | 85.99th | v4 (v2025.03.14) |
| May 4, 2025 | 5.65% (0.05646) | 89.83th | v4 (v2025.03.14) |
| May 1, 2025 | 3.01% (0.03006) | 85.89th | v4 (v2025.03.14) |
| Mar 30, 2025 | 5.65% (0.05646) | 89.41th | v4 (v2025.03.14) |
| Mar 29, 2025 | 9.82% (0.09816) | 88.19th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.38% (0.05384) | 89.40th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.20% (0.00198) | 58.69th | v3 (v2023.03.01) |
| May 18, 2024 | 0.20% (0.00198) | 57.22th | v3 (v2023.03.01) |
| May 8, 2023 | 0.18% (0.00175) | 53.10th | v3 (v2023.03.01) |
| Mar 20, 2023 | 0.19% (0.00188) | 54.62th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.16% (0.00162) | 51.08th | v3 (v2023.03.01) |
| Mar 6, 2023 | 6.42% (0.06425) | 91.03th | v2 (v2022.01.01) |
| Apr 1, 2022 | 6.42% (0.06425) | 90.14th | v2 (v2022.01.01) |
| Feb 4, 2022 | 6.42% (0.06425) | 78.00th | v2 (v2022.01.01) |
| Feb 3, 2022 | 17.87% (0.17867) | 92.85th | v1 |
| Jan 6, 2022 | 17.87% (0.17867) | 92.76th | v1 |
| Sep 1, 2021 | 17.87% (0.17867) | 97.76th | v1 |
| Jun 8, 2021 | 17.87% (0.17867) | 0.00th | v1 |
| Jun 3, 2021 | 17.32% (0.17316) | 0.00th | v1 |
| Apr 14, 2021 | 16.76% (0.16758) | 0.00th | v1 |
References (30)
- http://www.openwall.com/lists/oss-security/2018/03/24/4 mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- http://www.securityfocus.com/bid/103520 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1040568 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:3558 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0366 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0367 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2018-1283 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1560395 Issue Tracking
- https://httpd.apache.org/security/vulnerabilities_24.html x_refsource_CONFIRMVendor Advisory
- https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r15f9aa4427581a1aecb4063f1b4b983511ae1c9935e2a0a6876dad3c%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r6521a7f62276340eabdb3339b2aa9a38c5f59d978497a1f794af53be%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%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
- https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- 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
- https://lists.apache.org/thread.html/rfcf929bd33a6833e3f0c35eebdad70d5060665f9c4e17ea467c66770%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2018-1283
- https://security.netapp.com/advisory/ntap-20180601-0004/ x_refsource_CONFIRMThird Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03909en_us x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/3627-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/3627-2/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-1283
- https://www.debian.org/security/2018/dsa-4164 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.tenable.com/security/tns-2019-09 x_refsource_CONFIRM
Change history (0)
No recorded changes yet.