High severity · published Dec 13, 2019
CVE-2019-18838
An issue was discovered in Envoy 1.12.0
7.5
CVSS
2.1%
EPSS
No
On KEV
Description
An issue was discovered in Envoy 1.12.0. Upon receipt of a malformed HTTP request without a Host header, it sends an internally generated "Invalid request" response. This internally generated response is dispatched through the configured encoder filter chain before being sent to the client. An encoder filter that invokes route manager APIs that access a request's Host header causes a NULL pointer dereference, resulting in abnormal termination of the Envoy process.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 82% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EN
Envoy · Envoyproxy
through 1.12.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18838
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-18838
Product
https://blog.envoyproxy.io
Patch
https://github.com/envoyproxy/envoy/commits/master
Exploit
https://github.com/envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc
groups.google.com
https://groups.google.com/forum/#%21forum/envoy-users
More from Envoy
9.8
CVE-2026-111497
Out-of-Bounds Write in Google Brotli Decoder
7.5
CVE-2023-44487
HTTP/2 Rapid Reset Attack Vulnerability
10.0
CVE-2019-9901
Envoy 1.9.0 and before does not normalize HTTP URL paths
9.8
CVE-2023-35941
Envoy is an open source edge and service proxy designed for cloud-native applications
9.8
CVE-2023-27488
Envoy is an open source edge and service proxy designed for cloud-native applications