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Fencer Vulns
high 7.5

CVE-2024-27919 in the critical feed json

HTTP/2: memory exhaustion due to CONTINUATION frame flood

published 2024-04-04 2 y ago modified 2026-09-08 2 mo ago also BIT-envoy-2024-27919 , EUVD-2024-25106 , GHSA-gghf-vfxp-799r

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
83.9%
EPSS 83.9% chance of exploitation in 30 days, percentile 99.6%
public exploits
0
none known

Summary

Envoy is a cloud-native, open-source edge and service proxy. In versions 1.29.0 and 1.29.1, theEnvoy HTTP/2 protocol stack is vulnerable to the flood of CONTINUATION frames. Envoy's HTTP/2 codec does not reset a request when header map limits have been exceeded. This allows an attacker to send an sequence of CONTINUATION frames without the END_HEADERS bit set causing unlimited memory consumption. This can lead to denial of service through memory exhaustion. Users should upgrade to versions 1.29.2 to mitigate the effects of the CONTINUATION flood. Note that this vulnerability is a regression in Envoy version 1.29.0 and 1.29.1 only. As a workaround, downgrade to version 1.28.1 or earlier or disable HTTP/2 protocol for downstream connections.

Patch / fix

  • bitnami envoy 1.29.2
  • envoyproxy envoy 1.29.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-27919 updated cvss 7.5

envoy: CONTINUATION frames which enable DoS

  • Red Hat Custom Metric Autoscaler operator for Red Hat Openshift custom-metrics-autoscaler/custom-metrics-autoscaler-rhel8 Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/logging-loki-rhel8 Red Hat Logical Volume Manager Storage lvms4/topolvm-rhel9 Red Hat Migration Toolkit for Applications 6 mta/mta-hub-rhel8 Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-velero-plugin-for-gcp-rhel8 Red Hat OpenShift API for Data Protection oadp/oadp-velero-rhel9, oadp/oadp-velero-plugin-for-gcp-rhel9
    +15 more products
    Red Hat OpenShift Serverless openshift-serverless-1/eventing-mtping-rhel8 Red Hat OpenShift Service Mesh 2 openshift-service-mesh/istio-cni-rhel8 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-grafana-rhel8, rhacm2/management-ingress-rhel8 Red Hat Ceph Storage 5 rhceph/rhceph-5-dashboard-rhel8 Red Hat Ceph Storage 6 rhceph/rhceph-6-dashboard-rhel9 Red Hat Ceph Storage 7 rhceph/grafana-rhel9 Red Hat OpenShift Container Platform 4 openshift4/ose-prometheus, openshift-selinuxd-container, openshift4/ose-contour-rhel8 Red Hat Openshift Container Storage 4 ocs4/cephcsi-rhel8 Red Hat Openshift Data Foundation 4 odf4/odf-topolvm-rhel8 Red Hat OpenShift Data Science (RHODS) rhods/odh-operator-base-rhel8, rhods/odh-ml-pipelines-cache-rhel8 Red Hat OpenShift Dev Spaces devspaces/devspaces-rhel8-operator Red Hat OpenShift distributed tracing 2 rhosdt/tempo-gateway-rhel8 Red Hat OpenShift distributed tracing 3 rhosdt/opentelemetry-rhel8-operator Red Hat Openshift Sandboxed Containers openshift-sandboxed-containers/osc-rhel8-operator Red Hat OpenStack Platform 16.2 osp-director-provisioner-container
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

83.89% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami envoy
>=1.29.0, <1.29.2
1.29.2

Affected products

  • envoyproxy envoy

Classification

Weakness
  • CWE-390 Detection of Error Condition Without Action

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.