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Fencer Intel
high 7.5

CVE-2016-8745 in the critical feed json

Concurrent Execution using Shared Resource with Improper Synchronization in Apache Tomcat

published 2017-08-10 9 y ago modified 2026-06-17 4 mo ago also GHSA-w3j5-q8f2-3cqq , EUVD-2022-5479

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
16.0%
EPSS 16.0% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat 9.0.0.M1 to 9.0.0.M13, 8.5.0 to 8.5.8, 8.0.0.RC1 to 8.0.39, 7.0.0 to 7.0.73 and 6.0.16 to 6.0.48 resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, not not limited to, session ID and the response body. The bug was first noticed in 8.5.x onwards where it appears the refactoring of the Connector code for 8.5.x onwards made it more likely that the bug was observed. Initially it was thought that the 8.5.x refactoring introduced the bug but further investigation has shown that the bug is present in all currently supported Tomcat versions.

Patch / fix

  • maven org.apache.tomcat:tomcat-util 6.0.50, 7.0.75, 8.0.41, 8.5.9, 9.0.0.M14
  • tomcat7 Ubuntu 14.04 LTS 7.0.52-1ubuntu0.8
  • tomcat7 Ubuntu 16.04 LTS 7.0.68-1ubuntu0.3
  • tomcat8 Ubuntu 16.04 LTS 8.0.32-1ubuntu1.3

ubuntu advisories UBUNTU-CVE-2016-8745

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tomcat7 jboss enterprise web server 3.1 7.0.70-16.ep7.el7
  • tomcat8 jboss enterprise web server 3.1 8.0.36-17.ep7.el7
  • mod_cluster jboss enterprise web server 3.1 1.3.5-2.Final_redhat_2.1.ep7.el7
  • tomcat7-lib jboss enterprise web server 3.1 7.0.70-16.ep7.el7
  • tomcat8-lib jboss enterprise web server 3.1 8.0.36-17.ep7.el7
  • tomcat-vault jboss enterprise web server 3.1 1.0.8-9.Final_redhat_2.1.ep7.el7
  • tomcat7-jsvc jboss enterprise web server 3.1 7.0.70-16.ep7.el7
  • tomcat8-jsvc jboss enterprise web server 3.1 8.0.36-17.ep7.el7

red hat advisories RHSA-2017:0456RHSA-2017:0455RHSA-2017:0935RHSA-2017:0527

  • tomcat6 SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 6.0.53-0.56.1
  • tomcat SLES for SAP 12 SP1, SLES 12 SP1 8.0.43-10.19.1
  • tomcat SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 8.0.43-23.1
  • tomcat SLES for SAP 12, SLES 12-LTSS 7.0.78-7.13.4

suse advisories SUSE-SU-2017:1660-1SUSE-SU-2017:1632-1SUSE-SU-2017:1382-1SUSE-SU-2017:1229-1

  • tomcat openSUSE Tumbleweed 9.0.36-8.4
  • tomcat10 openSUSE Tumbleweed 10.1.14-1.1

opensuse advisories openSUSE-SU-2024:11468-1openSUSE-SU-2024:13441-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-8745 updated cvss 7.5

tomcat: information disclosure due to incorrect Processor sharing

  • Red Hat JBoss Enterprise Web Server 2 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat7 tomcat7, +6 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) tomcat 7.0.69-11.el7_3, tomcat-servlet-3.0-api 7.0.69-11.el7_3 Red Hat Enterprise Linux Client Optional (v. 7) tomcat 7.0.69-11.el7_3, tomcat-lib 7.0.69-11.el7_3, tomcat-jsvc 7.0.69-11.el7_3, tomcat-javadoc 7.0.69-11.el7_3, tomcat-webapps 7.0.69-11.el7_3, tomcat-el-2.2-api 7.0.69-11.el7_3, +3 more Red Hat Enterprise Linux ComputeNode (v. 7) tomcat 7.0.69-11.el7_3, tomcat-servlet-3.0-api 7.0.69-11.el7_3 Red Hat Enterprise Linux ComputeNode Optional (v. 7) tomcat 7.0.69-11.el7_3, tomcat-lib 7.0.69-11.el7_3, tomcat-jsvc 7.0.69-11.el7_3, tomcat-javadoc 7.0.69-11.el7_3, tomcat-webapps 7.0.69-11.el7_3, tomcat-el-2.2-api 7.0.69-11.el7_3, +3 more
    fixed: vendor fix RHSA-2017:0935
  • Red Hat Enterprise Linux Desktop Optional (v. 6) tomcat6 6.0.24-105.el6_8, tomcat6-lib 6.0.24-105.el6_8, tomcat6-javadoc 6.0.24-105.el6_8, tomcat6-webapps 6.0.24-105.el6_8, tomcat6-el-2.1-api 6.0.24-105.el6_8, tomcat6-docs-webapp 6.0.24-105.el6_8, +3 more Red Hat Enterprise Linux HPC Node Optional (v. 6) tomcat6 6.0.24-105.el6_8, tomcat6-lib 6.0.24-105.el6_8, tomcat6-javadoc 6.0.24-105.el6_8, tomcat6-webapps 6.0.24-105.el6_8, tomcat6-el-2.1-api 6.0.24-105.el6_8, tomcat6-docs-webapp 6.0.24-105.el6_8, +3 more Red Hat Enterprise Linux Server (v. 6) tomcat6 6.0.24-105.el6_8, tomcat6-lib 6.0.24-105.el6_8, tomcat6-el-2.1-api 6.0.24-105.el6_8, tomcat6-jsp-2.1-api 6.0.24-105.el6_8, tomcat6-servlet-2.5-api 6.0.24-105.el6_8
    fixed: vendor fix RHSA-2017:0527
  • Red Hat Enterprise Linux Server (v. 7) tomcat 7.0.69-11.el7_3, tomcat-lib 7.0.69-11.el7_3, tomcat-webapps 7.0.69-11.el7_3, tomcat-el-2.2-api 7.0.69-11.el7_3, tomcat-jsp-2.2-api 7.0.69-11.el7_3, tomcat-admin-webapps 7.0.69-11.el7_3, +1 more
    fixed: vendor fix RHSA-2017:0935
  • Red Hat Enterprise Linux Server Optional (v. 6) tomcat6 6.0.24-105.el6_8, tomcat6-javadoc 6.0.24-105.el6_8, tomcat6-webapps 6.0.24-105.el6_8, tomcat6-docs-webapp 6.0.24-105.el6_8, tomcat6-admin-webapps 6.0.24-105.el6_8
    fixed: vendor fix RHSA-2017:0527
  • Red Hat Enterprise Linux Server Optional (v. 7) tomcat 7.0.69-11.el7_3, tomcat-lib 7.0.69-11.el7_3, tomcat-jsvc 7.0.69-11.el7_3, tomcat-javadoc 7.0.69-11.el7_3, tomcat-webapps 7.0.69-11.el7_3, tomcat-el-2.2-api 7.0.69-11.el7_3, +3 more
    fixed: vendor fix RHSA-2017:0935
  • Red Hat Enterprise Linux Workstation (v. 6) tomcat6 6.0.24-105.el6_8, tomcat6-lib 6.0.24-105.el6_8, tomcat6-el-2.1-api 6.0.24-105.el6_8, tomcat6-jsp-2.1-api 6.0.24-105.el6_8, tomcat6-servlet-2.5-api 6.0.24-105.el6_8
    fixed: vendor fix RHSA-2017:0527
  • Red Hat Enterprise Linux Workstation (v. 7) tomcat 7.0.69-11.el7_3, tomcat-lib 7.0.69-11.el7_3, tomcat-webapps 7.0.69-11.el7_3, tomcat-el-2.2-api 7.0.69-11.el7_3, tomcat-jsp-2.2-api 7.0.69-11.el7_3, tomcat-admin-webapps 7.0.69-11.el7_3, +1 more
    fixed: vendor fix RHSA-2017:0935
show 6 more
  • Red Hat Enterprise Linux Workstation Optional (v. 6) tomcat6 6.0.24-105.el6_8, tomcat6-javadoc 6.0.24-105.el6_8, tomcat6-webapps 6.0.24-105.el6_8, tomcat6-docs-webapp 6.0.24-105.el6_8, tomcat6-admin-webapps 6.0.24-105.el6_8
    fixed: vendor fix RHSA-2017:0527
  • Red Hat Enterprise Linux Workstation Optional (v. 7) tomcat-jsvc 7.0.69-11.el7_3, tomcat-javadoc 7.0.69-11.el7_3, tomcat-docs-webapp 7.0.69-11.el7_3
    fixed: vendor fix RHSA-2017:0935
  • Red Hat JBoss Web Server 3.1
    fixed: vendor fix RHSA-2017:0457
  • Red Hat JBoss Web Server 3.1 for RHEL 6 tomcat7 7.0.70-16.ep7.el6, tomcat8 8.0.36-17.ep7.el6, tomcat7-lib 7.0.70-16.ep7.el6, tomcat8-lib 8.0.36-17.ep7.el6, tomcat7-jsvc 7.0.70-16.ep7.el6, tomcat8-jsvc 8.0.36-17.ep7.el6, +31 more
    fixed: vendor fix RHSA-2017:0455
  • Red Hat JBoss Web Server 3.1 for RHEL 7 tomcat7 7.0.70-16.ep7.el7, tomcat8 8.0.36-17.ep7.el7, tomcat7-lib 7.0.70-16.ep7.el7, tomcat8-lib 8.0.36-17.ep7.el7, tomcat7-jsvc 7.0.70-16.ep7.el7, tomcat8-jsvc 8.0.36-17.ep7.el7, +31 more
    fixed: vendor fix RHSA-2017:0456
  • Red Hat Enterprise Linux 5 tomcat5 Red Hat JBoss BRMS 5 jbossweb jbossweb Red Hat JBoss Data Grid 6 jbossweb jbossweb Red Hat JBoss Data Virtualization 6 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 5 jbossweb jbossweb Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb
    +3 more products
    Red Hat JBoss Fuse 6 karaf karaf Red Hat JBoss Fuse Service Works 6 jbossweb jbossweb Red Hat JBoss Operations Network 3 jbossweb jbossweb
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

16.04% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat-util
>=9.0.0.M1, <9.0.0.M14
>=8.5.0, <8.5.9
>=8.0.0-RC1, <8.0.41
>=7.0.0, <7.0.75
>=6.0.16, <6.0.50
9.0.0.M14
8.5.9
8.0.41
7.0.75
6.0.50

Affected products

  • Apache Software Foundation Apache Tomcat

Classification

Weakness
  • CWE-388 7PK - Errors
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.