CVE-2019-9901

highpriority · track · 42EPSS 0.050 · 92 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

4.95% (92nd) EPSS

CVSS 7.5 · high

Is it mine?

6 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

Envoy 1.9.0 and before does not normalize HTTP URL paths. A remote attacker may craft a relative path, e.g., something/../admin, to bypass access control, e.g., a block on /admin. A backend server could then interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedservicemesh-proxy-0:0.9.1-1.el7.src as a component of Red Hat OpenShift Service Mesh 0 Tech Previewredhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2019:0741
Fixedservicemesh-proxy-0:0.9.1-1.el7.x86_64 as a component of Red Hat OpenShift Service Mesh 0 Tech Previewredhat_csaf
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
https://access.redhat.com/errata/RHSA-2019:0741

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.5–10

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.010criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 6

v3.06.5mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:Lsecondary · cve@mitre.org USexploitability 2.2 · impact 3.7

v3.010criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · OSV

v3.09.1criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.08.3highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:Lsecondary · Red Hat Product Security US

v3.06.5mediumCVSS:3.0/AC:H/AV:N/A:L/C:L/I:L/PR:N/S:C/UI:Nsecondary · ENISA EU

v3.110criticalAV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-706USprimaryCWE-20USCWE-20USCWE-284USCWE-706US

affected products (6)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
Сообщество свободного программного обеспечения Envoy≤ 1.9.0fstec_bduRU
envoyproxy envoy≤ 1.9.0nvdUScpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Go github.com/envoyproxy/envoy< 1.9.1osvUSpkg:golang/github.com/envoyproxy/envoy
servicemesh-proxy-0:0.9.1-1.el7.src as a component of Red Hat OpenShift Service Mesh 0 Tech Previewall versionsfixedredhat_csafUS
servicemesh-proxy-0:0.9.1-1.el7.x86_64 as a component of Red Hat OpenShift Service Mesh 0 Tech Previewall versionsfixedredhat_csafUS

advisories (2)

Vendor and ecosystem advisories describing this.

RHSA-2019:0741Red Hat Security Advisory: Istio-Proxy Security Update2019-04-10csaf · redhat_csafUS
An update for Istio-Proxy is now available for Red Hat OpenShift Service Mesh Tech Preview 0.9.0. Red Hat Product Security has rated this update as having a security impact of important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
GHSA-2wmf-p7f8-w42hEnvoyProxy Envoy Missing HTTP URL path normalization2022-05-24ghsa · osvUS
Envoy 1.9.0 and before does not normalize HTTP URL paths. A remote attacker may craft a relative path, e.g., `something/../admin`, to bypass access control, e.g., a block on `/admin`. A backend server could then interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd redhat_csaf NVD CVE.org MITRE

published 2019-04-25modified 2026-06-17

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+185 more

references (16)

External citations — patches, advisories, analysis.

scry

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