CVE-2019-9901

MEDIUM

Envoy < 1.9.0 - Path Normalization Bypass via Relative Path Traversal

Title source: llm
STIX 2.1

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.

References (4)

Core 4
Core References
Release Notes, Vendor Advisory x_refsource_confirm
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history
Issue Tracking, Mitigation, Third Party Advisory x_refsource_confirm
https://github.com/envoyproxy/envoy/issues/6435

Scores

CVSS v3 6.5
EPSS 0.0268
EPSS Percentile 83.8%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L

Details

CWE
CWE-706
Status published
Products (2)
envoyproxy/envoy < 1.9.0
envoyproxy/envoy 0 - 1.9.1Go
Published Apr 25, 2019
Tracked Since Feb 18, 2026