CVE-2019-18836

Name: CVE-2019-18836
Creator: NVD / NIST
Published: 2019-11-11T01:15:10.21+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.94%

Last modified Jun 17, 2026

CVE-2019-18836 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.". EPSS estimates a 1.94% chance of exploitation in the next 30 days.

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."

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.94%

77.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-835

Affected Software

Vendor	Product	Versions
Envoyproxy	Envoy	1.12.0
Istio	Istio	>= 1.3.0, <= 1.3.3

References

https://blog.envoyproxy.ioVendor Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xvf-4396-cj46Exploit, Third Party Advisory
https://github.com/istio/istio/issues/18229Exploit, Third Party Advisory
https://groups.google.com/forum/#%21forum/envoy-users
https://blog.envoyproxy.ioVendor Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xvf-4396-cj46Exploit, Third Party Advisory
https://github.com/istio/istio/issues/18229Exploit, Third Party Advisory
https://groups.google.com/forum/#%21forum/envoy-users

Timeline

Published: Nov 11, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-18836?

How severe is CVE-2019-18836?

CVE-2019-18836 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.94% probability of exploitation in the next 30 days.

How do I fix CVE-2019-18836?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-18836?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST