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No exploitation reportedFix available

CVE-2019-18801

No exploitation reported by the sources we read.

  • Published2019-12-13
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Timeline

dates in UTC
  1. 2019-12-1313:15CVE publishedNVD

Versions per branch

NVD
Envoy
BranchAffectedFixed in
1.12≤ 1.12.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kialiRed Hat:service_mesh:1.0::el7all versions · fixed in 0:v1.0.8.redhat1-1.el7
  • servicemeshRed Hat:service_mesh:1.0::el8all versions · fixed in 0:1.0.3-1.el8and 11 other packages
  • servicemesh-grafanaRed Hat:service_mesh:1.0::el8all versions · fixed in 0:6.2.2-25.el8and 1 other package
  • servicemesh-prometheusRed Hat:service_mesh:1.0::el8all versions · fixed in 0:2.7.2-26.el8

Vendor advisories

  • CVE-2019-18801 Red Hat Product Security23 products fixed

    envoy: an untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1

  • RHSA-2019:4222 Red Hat Product Security23 products fixed

    Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.3 RPMs security update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:4222 · 23 productsThe OpenShift Service Mesh release notes provide information on the features and known issues: https://docs.openshift.com/container-platform/4.2/service_mesh/servicemesh-release-notes.html

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2019-12-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-288h-hv2q-fwrv

Frequently asked questions

What is CVE-2019-18801?

An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.

Is CVE-2019-18801 actively exploited?

Active exploitation of CVE-2019-18801 has not been confirmed. Its EPSS score was 2.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-18801?

CVE-2019-18801 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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