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CVE-2019-18838

24
FAUCET Score

CVE-2019-18838 affects Envoy 1.12.0, where a malformed HTTP request lacking a Host header can trigger a NULL pointer dereference. This occurs when an encoder filter, processing the internally generated "Invalid request" response, attempts to access the missing Host header via route manager APIs. The vulnerability has a CVSS score of 7.5 (High), indicating a network-based attack with low complexity that can lead to a denial of service (abnormal termination of the Envoy process). There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.12.1CPE matchmatch criteria
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.14%
Probability of exploitation in next 30 days
EPSS Percentile
80.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0214 is in the 65th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Openshift Service Mesh 1.0Fixed in: kiali-0:v1.0.8.redhat1-1.el7
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-0:1.0.3-1.el8
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-cni-0:1.0.3-1.el8
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-grafana-0:6.2.2-25.el8
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-operator-0:1.0.3-1.el8
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-prometheus-0:2.7.2-26.el8
View patch
redhatpatch availablevia redhat_api
Product: OpenShift Service Mesh 1.0Fixed in: servicemesh-proxy-0:1.0.3-1.el8
View patch

Vendor Advisories (1)

redhatCVE-2019-18838Important

envoy: malformed HTTP request without the Host header may cause abnormal termination of the Envoy process

Dec 10, 2019

References

blog.envoyproxy.io
Product
github.com / envoyproxy/envoy/commits/master
Patch
github.com / envoyproxy/envoy/security/advisories/GHSA-f2rv-4w6x-rwhc
ExploitThird Party Advisory
groups.google.com / forum