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    CVE-2021-42340

    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.

    Published:Oct 14, 2021
    Last Modified:Nov 21, 2024
    EPS:Oct 14, 2021
    EPSS Score:0.03003
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Tomcat
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Netapp
    Product
    Hci
    Vendor
    Netapp
    Product
    Management Services For Element Software
    Vendor
    Oracle
    Product
    Agile Engineering Data Management
    Vendor
    Oracle
    Product
    Big Data Spatial And Graph
    Vendor
    Oracle
    Product
    Communications Diameter Signaling Router
    Vendor
    Oracle
    Product
    Hospitality Cruise Shipboard Property Management System
    Vendor
    Oracle
    Product
    Managed File Transfer
    Vendor
    Oracle
    Product
    Middleware Common Libraries And Tools
    Vendor
    Oracle
    Product
    Payment Interface
    Vendor
    Oracle
    Product
    Retail Customer Insights
    Vendor
    Oracle
    Product
    Retail Data Extractor For Merchandising
    Vendor
    Oracle
    Product
    Retail Eftlink
    Vendor
    Oracle
    Product
    Retail Financial Integration
    Vendor
    Oracle
    Product
    Retail Store Inventory Management
    Vendor
    Oracle
    Product
    Sd-wan Edge
    Vendor
    Oracle
    Product
    Taleo Platform
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Enterprise Web Server
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Openshift Application Runtimes

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-469 HTTP DoS

    Related CVEs

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    CVE-2026-68763 (CVSS 7.5) — Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog …
    CVE-2026-68569 (CVSS 8.1) — Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPN…
    CVE-2026-68525 (CVSS 9.1) — Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a…
    CVE-2026-66422 (CVSS 8.1) — Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly…
    CVE-2026-65927 (CVSS 7.5) — Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite pr…
    CVE-2026-65905 (CVSS 9.8) — Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before wind…
    CVE-2026-65637 (CVSS 9.8) — Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This iss…
    CVE-2026-65183 (CVSS 8.1) — Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain soc…
    CVE-2026-65182 (CVSS 9.1) — Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint b…

    References

    https://kc.mcafee.com/corporate/index?page=content&id=SB10379
    https://lists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784%40%3Ccommits.myfaces.apache.org%3E
    https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3E
    https://security.gentoo.org/glsa/202208-34
    https://security.netapp.com/advisory/ntap-20211104-0001/
    https://www.debian.org/security/2021/dsa-5009
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html
    https://kc.mcafee.com/corporate/index?page=content&id=SB10379
    https://lists.apache.org/thread.html/r8097a2d1550aa78e585fc77e602b9046e6d4099d8d132497c5387784%40%3Ccommits.myfaces.apache.org%3E
    https://lists.apache.org/thread.html/r83a35be60f06aca2065f188ee542b9099695d57ced2e70e0885f905c%40%3Cannounce.tomcat.apache.org%3E
    https://security.gentoo.org/glsa/202208-34
    https://security.netapp.com/advisory/ntap-20211104-0001/
    https://www.debian.org/security/2021/dsa-5009
    https://www.oracle.com/security-alerts/cpuapr2022.html
    https://www.oracle.com/security-alerts/cpujan2022.html
    https://www.oracle.com/security-alerts/cpujul2022.html

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High