Vulnerability in Envoyproxy Envoy
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.050 (92.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.050 · newest: 0.050 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history (Release Notes, Vendor Advisory)
- github.com/envoyproxy/envoy/issues/6435 (Third Party Advisory, Mitigation, Issue Tracking)
- groups.google.com/forum/
- github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w
Frequently asked questions
- What is CVE-2019-9901?
- CVE-2019-9901 is a medium-severity vulnerability in Envoyproxy Envoy, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 6.5/10. Published 2019-04-25.
- How severe is CVE-2019-9901?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2019-9901 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.