🛡️ CVE-2019-9901 — envoy

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-706 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

EnvoyProxy Envoy Missing HTTP URL path normalization

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2019-9901 is recorded against 1 package.

  • github.com/envoyproxy/envoy

Timeline and source

Published on 24 May 2022 and last revised on 13 March 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)
groups.google.com (Web)
www.envoyproxy.io (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE CWE-706
Public Exploit ✅ No
Source OSV
Published 2022-05-24
Updated 2026-08-12
Modified 2026-03-13
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/envoyproxy/envoy — —

Similar Threats

Exploit Protection

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