CVE-2021-42340Not scoredCWE-772

CVE-2021-42340: DoS via memory leak with WebSocket connections

Apache Software Foundation · Apache Tomcat

Vendor fix available · Affected: Apache Software Foundation Apache Tomcat · Exploitation: likely to be exploited (10% or more)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

11.8%probability of exploitation in the next 30 days

96th percentile

050100

Higher than 96% of scored CVEs

Not scored yet. The CVE record carries no CVSS score.

DescriptionCVE.org

The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to 9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP upgrade connections was not released for WebSocket connections once the connection was closed. This created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

Apache Software Foundation · Apache TomcatApache Tomcat 10 10.0.0-M10 to 10.0.11; Apache Tomcat 10 10.1.0-M1 to 10.1.0-M5; Apache Tomcat 9 9.0.40 to 9.0.53; Apache Tomcat 8 8.5.60 to 8.5.71

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Missing Release of Resource after Effective Lifetime · Denial of Service
Vendor: Apache Software Foundation
Published: October 2021
Band: Likely to be exploited (10% or more), October 2021

CoverageNo articles yet

No CyberSIXT article names CVE-2021-42340 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.