CRITICAL
tomcat: Due to a mishandling of close in NIO/NIO2 connectors user sessions can get mixed up
Published Aug 2, 2018
9.1
CRITICALCVSS 3.0
EPSS 11.30%
Description
If an async request was completed by the application at the same time as the container triggered the async timeout, a race condition existed that could result in a user seeing a response intended for a different user. An additional issue was present in the NIO and NIO2 connectors that did not correctly track the closure of the connection when an async request was completed by the application and timed out by the container at the same time. This could also result in a user seeing a response intended for another user. Versions Affected: Apache Tomcat 9.0.0.M9 to 9.0.9 and 8.5.5 to 8.5.31.
Affected products
-
- Version 8.5.5 to 8.5.31StatusaffectedConstraints-
- Version 9.0.0.M9 to 9.0.9StatusaffectedConstraints-
- 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 Tomcat | n/a |
|
Configuration 1
OR
- ≥ 8.5.5 · ≤ 8.5.31
- ≥ 9.0.1 · ≤ 9.0.9
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
- 9.0.0
Configuration 2
- 9.0
No data.
Red Hat Enterprise Linux 8
pki-deps:10.6-8000020190524054914.55190bc5
Fixed · RHSA-2019:1529
Red Hat JBoss Web Server 5.0
n/a
Fixed · RHSA-2018:2867
Red Hat JBoss Web Server 5.0 on RHEL 6
jws5-tomcat-0:9.0.7-12.redhat_12.1.el6jws
Fixed · RHSA-2018:2868
Red Hat JBoss Web Server 5.0 on RHEL 7
jws5-tomcat-0:9.0.7-12.redhat_12.1.el7jws
Fixed · RHSA-2018:2868
Red Hat BPM Suite 6
tomcat
Not affected
Red Hat Enterprise Linux 6
tomcat6
Not affected
Red Hat Enterprise Linux 7
tomcat
Not affected
Red Hat Fuse 7
tomcat
Not affected
Red Hat JBoss BRMS 5
jbossweb
Not affected
Red Hat JBoss BRMS 6
tomcat
Not affected
Red Hat JBoss Data Grid 6
jbossweb
Not affected
Red Hat JBoss Data Grid 7
tomcat
Not affected
Red Hat JBoss Data Virtualization 6
jbossweb
Not affected
Red Hat JBoss Enterprise Application Platform 5
jbossweb
Not affected
Red Hat JBoss Enterprise Application Platform 6
jbossweb
Not affected
Red Hat JBoss Enterprise Web Server 2
tomcat6
Not affected
Red Hat JBoss Enterprise Web Server 2
tomcat7
Not affected
Red Hat JBoss Fuse 6
tomcat
Not affected
Red Hat JBoss Fuse Service Works 6
jbossweb
Not affected
Red Hat JBoss Operations Network 3
jbossweb
Not affected
Red Hat JBoss SOA Platform 5
jbossweb
Not affected
Red Hat JBoss Web Server 3
tomcat7
Not affected
Red Hat JBoss Web Server 3
tomcat8
Not affected
Red Hat OpenShift Application Runtimes
tomcat
Affected
Red Hat Software Collections
rh-java-common-tomcat
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | pki-deps:10.6-8000020190524054914.55190bc5 | Fixed | RHSA-2019:1529 |
| Red Hat JBoss Web Server 5.0 | n/a | Fixed | RHSA-2018:2867 |
| Red Hat JBoss Web Server 5.0 on RHEL 6 | jws5-tomcat-0:9.0.7-12.redhat_12.1.el6jws | Fixed | RHSA-2018:2868 |
| Red Hat JBoss Web Server 5.0 on RHEL 7 | jws5-tomcat-0:9.0.7-12.redhat_12.1.el7jws | Fixed | RHSA-2018:2868 |
| Red Hat BPM Suite 6 | tomcat | Not affected | n/a |
| Red Hat Enterprise Linux 6 | tomcat6 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | tomcat | Not affected | n/a |
| Red Hat Fuse 7 | tomcat | Not affected | n/a |
| Red Hat JBoss BRMS 5 | jbossweb | Not affected | n/a |
| Red Hat JBoss BRMS 6 | tomcat | Not affected | n/a |
| Red Hat JBoss Data Grid 6 | jbossweb | Not affected | n/a |
| Red Hat JBoss Data Grid 7 | tomcat | Not affected | n/a |
| Red Hat JBoss Data Virtualization 6 | jbossweb | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 5 | jbossweb | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | jbossweb | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | tomcat6 | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | tomcat7 | Not affected | n/a |
| Red Hat JBoss Fuse 6 | tomcat | Not affected | n/a |
| Red Hat JBoss Fuse Service Works 6 | jbossweb | Not affected | n/a |
| Red Hat JBoss Operations Network 3 | jbossweb | Not affected | n/a |
| Red Hat JBoss SOA Platform 5 | jbossweb | Not affected | n/a |
| Red Hat JBoss Web Server 3 | tomcat7 | Not affected | n/a |
| Red Hat JBoss Web Server 3 | tomcat8 | Not affected | n/a |
| Red Hat OpenShift Application Runtimes | tomcat | Affected | n/a |
| Red Hat Software Collections | rh-java-common-tomcat | Not affected | 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.
5.9 MEDIUM NVD
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact None
Availability Impact None
1 other source (Red Hat) ▾
9.1 CRITICAL Red Hat
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact None
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:P/I:N/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact None
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
11.30% 0.11296
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.11296
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 (50 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 11.30% (0.11296) | 95.85th | v5 (v2026.06.15) |
| Aug 28, 2026 | 10.75% (0.10745) | 95.57th | v5 (v2026.06.15) |
| Jun 15, 2026 | 12.06% (0.12058) | 95.59th | v5 (v2026.06.15) |
| Mar 28, 2026 | 8.45% (0.08448) | 92.31th | v4 (v2025.03.14) |
| Mar 4, 2026 | 6.63% (0.06632) | 91.01th | v4 (v2025.03.14) |
| Mar 1, 2026 | 2.26% (0.02264) | 84.42th | v4 (v2025.03.14) |
| Feb 4, 2026 | 6.96% (0.06958) | 91.22th | v4 (v2025.03.14) |
| Feb 1, 2026 | 2.38% (0.02383) | 84.70th | v4 (v2025.03.14) |
| Jan 19, 2026 | 6.96% (0.06958) | 91.17th | v4 (v2025.03.14) |
| Jan 4, 2026 | 8.85% (0.08852) | 92.28th | v4 (v2025.03.14) |
| Jan 1, 2026 | 3.09% (0.03086) | 86.44th | v4 (v2025.03.14) |
| Dec 18, 2025 | 8.85% (0.08852) | 92.25th | v4 (v2025.03.14) |
| Dec 4, 2025 | 6.44% (0.06436) | 90.67th | v4 (v2025.03.14) |
| Dec 1, 2025 | 2.23% (0.02227) | 84.05th | v4 (v2025.03.14) |
| Nov 21, 2025 | 6.44% (0.06436) | 90.65th | v4 (v2025.03.14) |
| Nov 18, 2025 | 8.94% (0.08939) | 91.74th | v4 (v2025.03.14) |
| Nov 4, 2025 | 4.87% (0.04873) | 89.06th | v4 (v2025.03.14) |
| Nov 1, 2025 | 1.66% (0.01662) | 81.54th | v4 (v2025.03.14) |
| Oct 4, 2025 | 4.87% (0.04873) | 89.09th | v4 (v2025.03.14) |
| Oct 1, 2025 | 1.66% (0.01662) | 81.50th | v4 (v2025.03.14) |
| Sep 15, 2025 | 4.60% (0.04601) | 88.83th | v4 (v2025.03.14) |
| Sep 4, 2025 | 5.69% (0.05692) | 90.07th | v4 (v2025.03.14) |
| Sep 1, 2025 | 2.08% (0.02082) | 83.38th | v4 (v2025.03.14) |
| Aug 4, 2025 | 6.24% (0.06241) | 90.53th | v4 (v2025.03.14) |
| Aug 1, 2025 | 1.59% (0.01587) | 80.96th | v4 (v2025.03.14) |
| Jul 7, 2025 | 6.24% (0.06241) | 90.43th | v4 (v2025.03.14) |
| Jul 4, 2025 | 4.98% (0.04978) | 89.21th | v4 (v2025.03.14) |
| Jul 1, 2025 | 1.55% (0.01546) | 80.60th | v4 (v2025.03.14) |
| Jun 4, 2025 | 5.05% (0.05055) | 89.25th | v4 (v2025.03.14) |
| Jun 1, 2025 | 1.55% (0.01546) | 80.54th | v4 (v2025.03.14) |
| May 4, 2025 | 5.15% (0.05148) | 89.29th | v4 (v2025.03.14) |
| May 1, 2025 | 1.58% (0.01576) | 80.59th | v4 (v2025.03.14) |
| Apr 3, 2025 | 5.15% (0.05148) | 88.92th | v4 (v2025.03.14) |
| Mar 30, 2025 | 6.45% (0.06451) | 90.14th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.90% (0.04900) | 82.26th | v4 (v2025.03.14) |
| Mar 17, 2025 | 6.45% (0.06451) | 90.37th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.32% (0.00315) | 71.14th | v3 (v2023.03.01) |
| Mar 7, 2024 | 0.44% (0.00443) | 74.32th | v3 (v2023.03.01) |
| Feb 2, 2024 | 0.44% (0.00443) | 72.31th | v3 (v2023.03.01) |
| Dec 24, 2023 | 0.52% (0.00521) | 74.26th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.48% (0.00480) | 73.07th | v3 (v2023.03.01) |
| Jul 27, 2023 | 0.51% (0.00511) | 73.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.54% (0.00543) | 73.85th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.24% (0.05242) | 89.75th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.24% (0.05242) | 88.72th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.24% (0.05242) | 75.28th | v2 (v2022.01.01) |
| Feb 3, 2022 | 14.74% (0.14737) | 89.78th | v1 |
| Jan 6, 2022 | 14.74% (0.14737) | 89.67th | v1 |
| Sep 1, 2021 | 14.74% (0.14737) | 97.05th | v1 |
| Apr 14, 2021 | 14.74% (0.14737) | 0.00th | v1 |
Weaknesses (1)
References (51)
- http://mail-archives.us.apache.org/mod_mbox/www-announce/201807.mbox/%3C20180722090623.GA92700%40minotaur.apache.org%3E mailing-listx_refsource_MLISTMailing ListVendor Advisory
- http://mail-archives.us.apache.org/mod_mbox/www-announce/201808.mbox/%3C0c616b4d-4e81-e7f8-b81d-1bb4c575aa33%40apache.org%3E mailing-listx_refsource_MLISTMailing ListVendor Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html x_refsource_CONFIRMPatchThird Party Advisory
- http://www.securityfocus.com/bid/104894 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1041376 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:2867 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2868 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:1529 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2018-8037 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1607582 Issue Tracking
- https://github.com/advisories/GHSA-6v52-mj5r-7j2m Advisory
- https://github.com/apache/tomcat/commit/4c04369c287233ea2e8e5135f6c31d02e2d76293
- https://github.com/apache/tomcat/commit/ccf2e6bf5205561ad18c2300153e9173ec509d73
- https://github.com/apache/tomcat/commit/ed4b9d791f9470e4c3de691dd0153a9ce431701b
- https://github.com/apache/tomcat/commit/f94eedf02b5973598ab3dbbd4504da588e9ba6cb
- https://lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/2ee3af8a43cb019e7898c9330cc8e73306553a27f2e4735dfb522d39%40%3Cusers.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/2ee3af8a43cb019e7898c9330cc8e73306553a27f2e4735dfb522d39@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/5c0e00fd31efc11e147bf99d0f03c00a734447d3b131ab0818644cdb%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/5c0e00fd31efc11e147bf99d0f03c00a734447d3b131ab0818644cdb@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/5d15316dfb4adf75d96d394745f8037533fa3bcc1ac8f619bf5c044c%40%3Cusers.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/5d15316dfb4adf75d96d394745f8037533fa3bcc1ac8f619bf5c044c@%3Cusers.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/e85e83e9954f169bbb77b44baae5a33d8de878df557bb32b7f793661%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/e85e83e9954f169bbb77b44baae5a33d8de878df557bb32b7f793661@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/eb6efa8d59c45a7a9eff94c4b925467d3b3fec8ba7697f3daa314b04%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/eb6efa8d59c45a7a9eff94c4b925467d3b3fec8ba7697f3daa314b04@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/r6ccee4e849bc77df0840c7f853f6bd09d426f6741247da2b7429d5d9@%3Cdev.tomcat.apache.org%3E
- https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a@%3Cdev.tomcat.apache.org%3E
- https://nvd.nist.gov/vuln/detail/CVE-2018-8037
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Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner apache
Published Aug 2, 2018
Updated Sep 16, 2024
Reserved Mar 9, 2018
Link CVE-2018-8037
CISA Vulnrichment
GHSA-6V52-MJ5R-7J2M Updated n/a