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CVE-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…
Medium6.5EPSS 5.0%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| mitreCNA (assigner) | 3.0 | Medium6.5 | CVSS:3.0/AC:H/AV:N/A:L/C:L/I:L/PR:N/S:C/UI:N |
| NVDNVD · Modified | 3.0 | Critical10.0 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 5.0% · top 7.8% of all CVEs (5 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
Affected products
n/a
- affected n/a
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/envoyproxy/envoyGHSA-2wmf-p7f8-w42h (opens in a new tab)
References (4)
- https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/envoyproxy/envoy/issues/6435 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-2wmf-p7f8-w42h (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2019-9901)Record last updated .