CVE-2016-8745: Apache Tomcat Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-w3j5-q8f2-3cqq
Share
CVSS 7.5
CWE-362
Published
Advisory Summary

CVE-2016-8745 is a HIGH (CVSS 7.5) remote code execution vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Apache Tomcat libraries in the Maven ecosystem. The issue involves concurrent execution using shared resource with improper synchronization in apache tomcat. Remediation is available by upgrading affected packages to version 9.0.0.M14, 8.5.9, 8.0.41, 7.0.75, 6.0.50.

CVE-2016-8745 at a Glance

CVE Identifier CVE-2016-8745
GHSA Identifier GHSA-w3j5-q8f2-3cqq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Apache Tomcat
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2016-8745

To remediate this vulnerability, upgrade all affected Apache Tomcat dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.tomcat:tomcat-util fixed: 9.0.0.M14 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-util</artifactId>
    <version>9.0.0.M14</version>
</dependency>
org.apache.tomcat:tomcat-util fixed: 8.5.9 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-util</artifactId>
    <version>8.5.9</version>
</dependency>
org.apache.tomcat:tomcat-util fixed: 8.0.41 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-util</artifactId>
    <version>8.0.41</version>
</dependency>
org.apache.tomcat:tomcat-util fixed: 7.0.75 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-util</artifactId>
    <version>7.0.75</version>
</dependency>
org.apache.tomcat:tomcat-util fixed: 6.0.50 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-util</artifactId>
    <version>6.0.50</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.tomcat

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2016-8745, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.tomcat

Analyze the terminal output to locate any version of Apache Tomcat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.0.0.M14), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.tomcat command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. In Apache Tomcat, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2016-8745 Affected Apache Tomcat Versions

5 component(s)
Fixed Versions:
9.0.0.M148.5.98.0.417.0.756.0.50
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.tomcat:tomcat-util
maven/org.apache.tomcat/tomcat-util
Maven
≥ 9.0.0.M1
< 9.0.0.M14
9.0.0.M14
org.apache.tomcat:tomcat-util
maven/org.apache.tomcat/tomcat-util
Maven
≥ 8.5.0
< 8.5.9
8.5.9
org.apache.tomcat:tomcat-util
maven/org.apache.tomcat/tomcat-util
Maven
≥ 8.0.0-RC1
< 8.0.41
8.0.41
org.apache.tomcat:tomcat-util
maven/org.apache.tomcat/tomcat-util
Maven
≥ 7.0.0
< 7.0.75
7.0.75
org.apache.tomcat:tomcat-util
maven/org.apache.tomcat/tomcat-util
Maven
≥ 6.0.16
< 6.0.50
6.0.50

References

NVD — CVE-2016-8745 NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-8745
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/143bb466cf96a89e791b7db5626055ea819dad89
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/16a57bc885e212839f1d717b94b01d154a36943a
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/cbc9b18a845d3c8c053ac293dffda6c6c19dd92b
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat80/commit/3dd2fec73e0de1edc1d3eb1c52a01255fdfc84e7
access.redhat.com/errata/rhsa-2017:04... WEB
https://access.redhat.com/errata/RHSA-2017:0455
lists.apache.org/thread.html/b5e3f51... WEB
https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/b5e3f51... WEB
https://lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc@%3Cdev.tomcat.apache.org%3E
Apache Tomcat Security Information SECURITY
https://security.gentoo.org/glsa/201705-09
lists.apache.org/thread.html/b84ad12... WEB
https://lists.apache.org/thread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5cef6b95%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/b84ad12... WEB
https://lists.apache.org/thread.html/b84ad1258a89de5c9c853c7f2d3ad77e5b8b2930be9e132d5cef6b95@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/b8a1bf1... WEB
https://lists.apache.org/thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/b8a1bf1... WEB
https://lists.apache.org/thread.html/b8a1bf18155b552dcf9a928ba808cbadad84c236d85eab3033662cfb@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r03c597... WEB
https://lists.apache.org/thread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe02859c%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r03c597... WEB
https://lists.apache.org/thread.html/r03c597a64de790ba42c167efacfa23300c3d6c9fe589ab87fe02859c@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r3bbb80... WEB
https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r3bbb80... WEB
https://lists.apache.org/thread.html/r3bbb800a816d0a51eccc5a228c58736960a9fffafa581a225834d97d@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r48c144... WEB
https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r48c144... WEB
https://lists.apache.org/thread.html/r48c1444845fe15a823e1374674bfc297d5008a5453788099ea14caf0@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r587e50... WEB
https://lists.apache.org/thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r587e50... WEB
https://lists.apache.org/thread.html/r587e50b86c1a96ee301f751d50294072d142fd6dc08a8987ae9f3a9b@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r9136ff... WEB
https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r9136ff... WEB
https://lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c@%3Cdev.tomcat.apache.org%3E
Apache Tomcat Security Information SECURITY
https://security.netapp.com/advisory/ntap-20180607-0002
Apache Tomcat Security Information SECURITY
https://web.archive.org/web/20200227165932/http://www.securityfocus.com/bid/94828
Apache Tomcat Security Information SECURITY
https://web.archive.org/web/20200517114357/http://www.securitytracker.com/id/1037432
access.redhat.com/errata/rhsa-2017:04... WEB
https://access.redhat.com/errata/RHSA-2017:0456
access.redhat.com/errata/rhsa-2017:09... WEB
https://access.redhat.com/errata/RHSA-2017:0935
Apache Tomcat Source Repository REPOSITORY
https://github.com/apache/tomcat
lists.apache.org/thread.html/343558d... WEB
https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/343558d... WEB
https://lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/3722040... WEB
https://lists.apache.org/thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/3722040... WEB
https://lists.apache.org/thread.html/37220405a377c0182d2afdbc36461c4783b2930fbeae3a17f1333113@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/388a323... WEB
https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/388a323... WEB
https://lists.apache.org/thread.html/388a323769f1dff84c9ec905455aa73fbcb20338e3c7eb131457f708@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/39ae1f0... WEB
https://lists.apache.org/thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/39ae1f0... WEB
https://lists.apache.org/thread.html/39ae1f0bd5867c15755a6f959b271ade1aea04ccdc3b2e639dcd903b@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/3d19773... WEB
https://lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/3d19773... WEB
https://lists.apache.org/thread.html/3d19773b4cf0377db62d1e9328bf9160bf1819f04f988315086931d7@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/4113c05... WEB
https://lists.apache.org/thread.html/4113c05d37f37c12b8033205684f04033c5f7a9bae117d4af23b32b4%40%3Cannounce.tomcat.apache.org%3E
lists.apache.org/thread.html/4113c05... WEB
https://lists.apache.org/thread.html/4113c05d37f37c12b8033205684f04033c5f7a9bae117d4af23b32b4@%3Cannounce.tomcat.apache.org%3E
lists.apache.org/thread.html/6af4712... WEB
https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/6af4712... WEB
https://lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/845312a... WEB
https://lists.apache.org/thread.html/845312a10aabbe2c499fca94003881d2c79fc993d85f34c1f5c77424%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/845312a... WEB
https://lists.apache.org/thread.html/845312a10aabbe2c499fca94003881d2c79fc993d85f34c1f5c77424@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/8885587... WEB
https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/8885587... WEB
https://lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a@%3Cdev.tomcat.apache.org%3E
rhn.redhat.com/errata/rhsa-2017-04... WEB
http://rhn.redhat.com/errata/RHSA-2017-0457.html
rhn.redhat.com/errata/rhsa-2017-05... WEB
http://rhn.redhat.com/errata/RHSA-2017-0527.html
Apache Tomcat Security Information SECURITY
http://www.debian.org/security/2017/dsa-3754
Apache Tomcat Security Information SECURITY
http://www.debian.org/security/2017/dsa-3755
Apache Tomcat Security Information SECURITY
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
Apache Tomcat Security Information SECURITY
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html

Frequently Asked Questions

What is CVE-2016-8745?
CVE-2016-8745 is a security vulnerability in Apache Tomcat involving Concurrent Execution using Shared Resource with Improper Synchronization in Apache Tomcat under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Apache Tomcat versions are affected?
Affected versions include releases prior to 9.0.0.M14, 8.5.9, 8.0.41, 7.0.75, 6.0.50 across affected packages: org.apache.tomcat:tomcat-util.
What version fixes CVE-2016-8745?
Upgrading to 9.0.0.M14, 8.5.9, 8.0.41, 7.0.75, 6.0.50 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tomcat-util affected?
Yes, org.apache.tomcat:tomcat-util is affected in releases prior to 9.0.0.M14, 8.5.9, 8.0.41, 7.0.75, 6.0.50. Upgrade your dependency to 9.0.0.M14, 8.5.9, 8.0.41, 7.0.75, 6.0.50 or later.
What is the CVSS score of CVE-2016-8745?
CVE-2016-8745 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2016-8745?
CVE-2016-8745 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check Maven dependencies for CVE-2016-8745?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.tomcat'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-w3j5-q8f2-3cqq",
  "modified" : "2025-09-02T22:30:26Z",
  "published" : "2022-05-14T01:10:16Z",
  "aliases" : [ "CVE-2016-8745" ],
  "summary" : "Concurrent Execution using Shared Resource with Improper Synchronization in Apache Tomcat",
  "details" : "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.",
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    "url" : "https://access.redhat.com/errata/RHSA-2017:0455"
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  "database_specific" : {
    "cwe_ids" : [ "CWE-362" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-06T19:48:38Z",
    "nvd_published_at" : "2017-08-10T22:29:00Z"
  }
}