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Vulnerability record · CVE-2019-9901 · published 25 April 2019

CVE-2019-9901: Envoyproxy envoy vulnerability

Envoyproxy · Envoy

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.

10.0 CVSS 3.0 Critical EPSS 5.0% · top 8.1% CWE-706 · CWE-706
10.0CVSS 3.0 base score, v2 7.5
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/envoyproxy/envoy/issues/6435 Issue TrackingMitigationThird Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history Release NotesVendor Advisory
https://github.com/envoyproxy/envoy/issues/6435 Issue TrackingMitigationThird Party Advisory
https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-9901), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.