CVE-2019-9901
EnvoyProxy Envoy Missing HTTP URL path normalization
10.0
CRITICAL
CVSS 3.1
EPSS 0.09%
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.
How to fix CVE-2019-9901
To remediate CVE-2019-9901, upgrade the affected package to a fixed version below.
- —upgrade to 1.9.1 or later
Is CVE-2019-9901 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.9.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL10.0 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |