CVSS 3.0
10.0 criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCVE-2019-9901
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.
Severity
- EPSS
- 5.0% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
- CWE
- CWE-706
- Published
- Modified
- Record from
- the NVD, synced
Affected
- envoyproxy:envoy
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-2wmf-p7f8-w42h | Go | github.com/envoyproxy/envoy | <1.9.1 | 1.9.1 |
References
- https://github.com/envoyproxy/envoy/issues/6435
- 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
- https://github.com/envoyproxy/envoy/issues/6435