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CVE-2019-18802

30
FAUCET Score

CVE-2019-18802 is a critical vulnerability affecting Envoy 1.12.0, where an untrusted remote client can bypass security policies by injecting whitespace after HTTP header content, causing Envoy to misinterpret header values. With a CVSS score of 9.8, this vulnerability presents a high-impact threat (confidentiality, integrity, availability) with low attack complexity and no user interaction required. Despite its critical severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

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

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.46%
Probability of exploitation in next 30 days
EPSS Percentile
82.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0246 is in the 73rd percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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-2019-18802Important

envoy: malformed request header may cause bypass of route matchers resulting in escalation of privileges or information disclosure

Dec 10, 2019

References

lists.opensuse.org / opensuse-security-announce/2020-03/msg00034.html
blog.envoyproxy.io
Product
github.com / envoyproxy/envoy/commits/master
Patch
github.com / envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4
ExploitThird Party Advisory
groups.google.com / forum