CRITICAL
istio/envoy: Path traversal via URL Patch manipulation in HTTP/1.x header
Published Apr 25, 2019
10.0
CRITICALCVSS 3.0
EPSS 4.95%
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.
Affected products
No data.
- ≤ 1.9.0
No data.
OpenShift Service Mesh Tech Preview
servicemesh-proxy-0:0.9.1-1.el7
Fixed · RHSA-2019:0741
| Product | Package | State | Advisory |
|---|---|---|---|
| OpenShift Service Mesh Tech Preview | servicemesh-proxy-0:0.9.1-1.el7 | Fixed | RHSA-2019:0741 |
github.com/envoyproxy/envoy
Go
Introduced 0 Fixed 1.9.1
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/envoyproxy/envoy | 0 | 1.9.1 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
10.0 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact High
Integrity Impact High
Availability Impact High
2 other sources (MITRE, Red Hat) ▾
6.5 MEDIUM MITRE
CVSS:3.0/AC:H/AV:N/A:L/C:L/I:L/PR:N/S:C/UI:N
Attack Complexity High
Attack Vector Network
Availability Impact Low
Confidentiality Impact Low
Integrity Impact Low
Privileges Required None
Scope Changed
User Interaction None
8.3 HIGH Red Hat
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact Low
Integrity Impact Low
Availability Impact Low
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
4.95% 0.04951
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.04951
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 4.95% (0.04951) | 91.90th | v5 (v2026.06.15) |
| Aug 9, 2026 | 4.95% (0.04951) | 91.35th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.68% (0.02680) | 83.81th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00072) | 19.27th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.36% (0.00356) | 72.32th | v3 (v2023.03.01) |
| Apr 18, 2024 | 0.36% (0.00356) | 71.81th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.43% (0.00432) | 73.83th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.43% (0.00432) | 71.62th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.48% (0.00481) | 72.13th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.21% (0.01213) | 64.21th | v2 (v2022.01.01) |
| Feb 4, 2022 | 15.35% (0.15351) | 91.59th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.60% (0.05603) | 80.32th | v5 (v2026.06.15) |
| Jan 6, 2022 | 5.60% (0.05603) | 80.12th | v1 |
| Sep 1, 2021 | 1.31% (0.01306) | 69.61th | v1 |
| Apr 14, 2021 | 1.31% (0.01306) | 0.00th | v1 |
Weaknesses (2)
References (12)
- https://access.redhat.com/security/cve/CVE-2019-9901 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1698025 Issue Tracking
- https://github.com/advisories/GHSA-2wmf-p7f8-w42h Advisory
- https://github.com/envoyproxy/envoy/blob/main/security/postmortems/cve-2019-9900.md
- https://github.com/envoyproxy/envoy/commit/e668e669677e52a00d99652b5a260d1cedafdfa8
- https://github.com/envoyproxy/envoy/issues/6435 x_refsource_CONFIRMIssue TrackingMitigationThird Party Advisory
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w x_refsource_CONFIRM
- https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM
- https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2019-9901
- https://www.cve.org/CVERecord?id=CVE-2019-9901
- https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history x_refsource_CONFIRMRelease NotesVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-9901 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1698025 | Issue Tracking | |
| https://github.com/advisories/GHSA-2wmf-p7f8-w42h | Advisory | |
| https://github.com/envoyproxy/envoy/blob/main/security/postmortems/cve-2019-9900.md | ||
| https://github.com/envoyproxy/envoy/commit/e668e669677e52a00d99652b5a260d1cedafdfa8 | ||
| https://github.com/envoyproxy/envoy/issues/6435 | x_refsource_CONFIRMIssue TrackingMitigationThird Party Advisory | |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w | x_refsource_CONFIRM | |
| https://groups.google.com/forum/#!topic/envoy-announce/VoHfnDqZiAM | ||
| https://groups.google.com/forum/#%21topic/envoy-announce/VoHfnDqZiAM | x_refsource_CONFIRM | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-9901 | ||
| https://www.cve.org/CVERecord?id=CVE-2019-9901 | ||
| https://www.envoyproxy.io/docs/envoy/v1.9.1/intro/version_history | x_refsource_CONFIRMRelease NotesVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Apr 25, 2019
Updated Aug 4, 2024
Reserved Mar 21, 2019
Link CVE-2019-9901
CISA Vulnrichment
GHSA-2WMF-P7F8-W42H Updated n/a