Critical severity · published Apr 25, 2019
CVE-2019-9901
Envoy 1.9.0 and before does not normalize HTTP URL paths
10.0
CVSS
5%
EPSS
No
On KEV
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 vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)5.0% · higher than 92% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EN
Envoy · Envoyproxy
through 1.9.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-9901
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-9901
Issue Tracking
https://github.com/envoyproxy/envoy/issues/6435
github.com
https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w
groups.google.com
https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM
Release Notes
https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history
More from Envoy
7.5
CVE-2023-44487
HTTP/2 Rapid Reset Attack Vulnerability
9.8
CVE-2023-35941
Envoy is an open source edge and service proxy designed for cloud-native applications
9.8
CVE-2023-27488
Envoy is an open source edge and service proxy designed for cloud-native applications
9.8
CVE-2022-21654
Envoy is an open source edge and service proxy, designed for cloud-native applications
9.8
CVE-2019-18802
An issue was discovered in Envoy 1.12.0