# CVE-2024-1300: Io.vertx:vertx-core: memory leak when a tcp server is configured with tls and sni support

Status: published. Published: 2024-04-02. Updated: 2026-11-05.

A vulnerability in the Eclipse Vert.x toolkit causes a memory leak in TCP servers configured with TLS and SNI support. When processing an unknown SNI server name assigned the default certificate instead of a mapped certificate, the SSL context is erroneously cached in the server name map, leading to memory exhaustion. This flaw allows attackers to send TLS client hello messages with fake server names, triggering a JVM out-of-memory error.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. (source: CNA: redhat)

## Affected products and versions

-  /  (io.vertx:vertx-core): ≥ 4.3.4; ≤ 4.5.2 (affected, semver). Source: CNA: redhat
- Red Hat / CEQ 3.2 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Cryostat 2 on RHEL 8 (cryostat-tech-preview/cryostat-grafana-dashboard-rhel8): ≥ 2.4.0-7; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cryostat 2 on RHEL 8 (cryostat-tech-preview/cryostat-operator-bundle): ≥ 2.4.0-4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cryostat 2 on RHEL 8 (cryostat-tech-preview/cryostat-reports-rhel8): ≥ 2.4.0-4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cryostat 2 on RHEL 8 (cryostat-tech-preview/cryostat-rhel8): ≥ 2.4.0-4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cryostat 2 on RHEL 8 (cryostat-tech-preview/cryostat-rhel8-operator): ≥ 2.4.0-9; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cryostat 2 on RHEL 8 (cryostat-tech-preview/jfr-datasource-rhel8): ≥ 2.4.0-4; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Migration Toolkit for Runtimes 1 on RHEL 8 (mtr/mtr-operator-bundle): ≥ 1.2-18; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Migration Toolkit for Runtimes 1 on RHEL 8 (mtr/mtr-rhel8-operator): ≥ 1.2-11; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Migration Toolkit for Runtimes 1 on RHEL 8 (mtr/mtr-web-container-rhel8): ≥ 1.2-12; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Migration Toolkit for Runtimes 1 on RHEL 8 (mtr/mtr-web-executor-container-rhel8): ≥ 1.2-10; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / MTA-6.2-RHEL-9 (mta/mta-windup-addon-rhel9): ≥ 6.2.3-2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat AMQ Streams 2.7.0 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4.4.1 for Spring Boot 3.2 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Quarkus 3.2.11.Final (io.vertx/vertx-core): ≥ 4.4.8.redhat-00001; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / RHINT Service Registry 2.5.11 GA (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / A-MQ Clients 2 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / OpenShift Serverless (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat AMQ Broker 7 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel 4 for Quarkus 3 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Apache Camel for Spring Boot 3 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Build of Keycloak (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of OptaPlanner 8 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat build of Quarkus (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Data Grid 8 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Fuse 7 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Integration Camel K 1 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Integration Camel Quarkus 2 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Data Grid 7 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 7 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform 8 (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack (vertx-core): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Process Automation 7 (vertx-core): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 1.06% as of 2026-11-04; percentile 64.77%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-772

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2024:1662 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:1706 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:1923 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:2088 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:2833 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:3527 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:3989 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2024:4884 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2024-1300 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2263139 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://vertx.io/docs/vertx-core/java/#_server_name_indication_sni. (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2024:1662 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:1706 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:1923 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:2088 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:2833 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:3527 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:3989 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/errata/RHSA-2024:4884 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred)

- https://access.redhat.com/security/cve/CVE-2024-1300 (ADP: CVE; vdb-entry, x_refsource_REDHAT, x_transferred)

- https://bugzilla.redhat.com/show_bug.cgi?id=2263139 (ADP: CVE; issue-tracking, x_refsource_REDHAT, x_transferred)

- https://vertx.io/docs/vertx-core/java/#_server_name_indication_sni. (ADP: CVE; x_transferred)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2024-1300; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2024-1300; retrieved 2026-11-05; source updated Not reported

Revision: 74b3d3408454990395778e7d266d992dae20c77a15f1ba0bb8d160957d8ca262

Canonical: https://y2.dev/cve/CVE-2024-1300

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