Vulnerability Database

393,392

Total vulnerabilities in the database

CVE-2018-8037 — org.apache.tomcat.embed / tomcat-embed-core

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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.

CVSS v3:

  • Severity: Medium
  • Score: 5.9
  • AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2:

  • Severity: Medium
  • Score: 4.3
  • AV:N/AC:M/Au:N/C:P/I:N/A:N

CWEs:

Software Affected versions
Maven icon org.apache.tomcat.embed / tomcat-embed-core >= 8.5.5, < 8.5.32
Maven icon org.apache.tomcat.embed / tomcat-embed-core >= 9.0.0.M9, < 9.0.10
apache / tomcat >= 8.5.5, <= 8.5.31
apache / tomcat >= 9.0.1, <= 9.0.9
apache / tomcat = 9.0.0
apache / tomcat = 9.0.0-milestone10
apache / tomcat = 9.0.0-milestone11
apache / tomcat = 9.0.0-milestone12
apache / tomcat = 9.0.0-milestone13
apache / tomcat = 9.0.0-milestone14
apache / tomcat = 9.0.0-milestone15
apache / tomcat = 9.0.0-milestone16
apache / tomcat = 9.0.0-milestone17
apache / tomcat = 9.0.0-milestone18
apache / tomcat = 9.0.0-milestone19
apache / tomcat = 9.0.0-milestone20
apache / tomcat = 9.0.0-milestone21
apache / tomcat = 9.0.0-milestone22
apache / tomcat = 9.0.0-milestone23
apache / tomcat = 9.0.0-milestone24
apache / tomcat = 9.0.0-milestone25
apache / tomcat = 9.0.0-milestone26
apache / tomcat = 9.0.0-milestone27
apache / tomcat = 9.0.0-milestone9
debian / debian_linux = 9.0

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.