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No exploitation reported

CVE-2019-18836

No exploitation reported by the sources we read.

  • Published2019-11-11
  • WeaknessCWE-835

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

Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated by a single idle TCP connection being able to keep a worker thread in an infinite busy loop when continue_on_listener_filters_timeout is used."

Timeline

dates in UTC
  1. 2019-11-1101:15CVE publishedNVD

Versions per branch

NVD
Envoy
BranchAffectedFixed in
1.12= 1.12.0no fix published
Istio
BranchAffectedFixed in
1.3≥ 1.3.0, ≤ 1.3.3no 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.

Vendor advisories

  • CVE-2019-18836 Red Hat Product Security

    envoy: excessive iteration due to listener filter timeout leads to DoS

Full record on NVD

Fix

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:N/I:N/A:H
Published
2019-11-11
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4r53-8549-7m3r

Frequently asked questions

What is CVE-2019-18836?

Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated by a single idle TCP connection being able to keep a worker thread in an infinite busy loop when continue_on_listener_filters_timeout is used."

Is CVE-2019-18836 actively exploited?

Active exploitation of CVE-2019-18836 has not been confirmed. Its EPSS score was 1.9% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-18836?

CVE-2019-18836 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Sources for this record