envoy: malformed request header may cause bypass of route matchers resulting in escalation of privileges or information disclosure
Published Dec 13, 2019
9.8
CRITICALCVSS 3.1
EPSS 2.46%
Description
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass "example.com" matchers.
Affected products
No data.
- ≤ 1.12.1
No data.
OpenShift Service Mesh 1.0
servicemesh-0:1.0.3-1.el8
Fixed · RHSA-2019:4222
OpenShift Service Mesh 1.0
servicemesh-cni-0:1.0.3-1.el8
Fixed · RHSA-2019:4222
OpenShift Service Mesh 1.0
servicemesh-grafana-0:6.2.2-25.el8
Fixed · RHSA-2019:4222
OpenShift Service Mesh 1.0
servicemesh-operator-0:1.0.3-1.el8
Fixed · RHSA-2019:4222
OpenShift Service Mesh 1.0
servicemesh-prometheus-0:2.7.2-26.el8
Fixed · RHSA-2019:4222
OpenShift Service Mesh 1.0
servicemesh-proxy-0:1.0.3-1.el8
Fixed · RHSA-2019:4222
Openshift Service Mesh 1.0
kiali-0:v1.0.8.redhat1-1.el7
Fixed · RHSA-2019:4222
| Product | Package | State | Advisory |
|---|---|---|---|
| OpenShift Service Mesh 1.0 | servicemesh-0:1.0.3-1.el8 | Fixed | RHSA-2019:4222 |
| OpenShift Service Mesh 1.0 | servicemesh-cni-0:1.0.3-1.el8 | Fixed | RHSA-2019:4222 |
| OpenShift Service Mesh 1.0 | servicemesh-grafana-0:6.2.2-25.el8 | Fixed | RHSA-2019:4222 |
| OpenShift Service Mesh 1.0 | servicemesh-operator-0:1.0.3-1.el8 | Fixed | RHSA-2019:4222 |
| OpenShift Service Mesh 1.0 | servicemesh-prometheus-0:2.7.2-26.el8 | Fixed | RHSA-2019:4222 |
| OpenShift Service Mesh 1.0 | servicemesh-proxy-0:1.0.3-1.el8 | Fixed | RHSA-2019:4222 |
| Openshift Service Mesh 1.0 | kiali-0:v1.0.8.redhat1-1.el7 | Fixed | RHSA-2019:4222 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (16 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.46% (0.02457) | 83.86th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.46% (0.02457) | 82.27th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00041) | 9.68th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.51% (0.00508) | 76.76th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.51% (0.00508) | 75.86th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.51% (0.00508) | 73.81th | v3 (v2023.03.01) |
| Apr 17, 2023 | 0.35% (0.00347) | 67.32th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.29% (0.00287) | 63.85th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.02% (0.01018) | 38.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.02% (0.01018) | 36.86th | v2 (v2022.01.01) |
| Feb 4, 2022 | 15.35% (0.15351) | 91.59th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.36% (0.05363) | 79.74th | v1 |
| Jan 6, 2022 | 5.36% (0.05363) | 79.54th | v1 |
| Sep 1, 2021 | 1.25% (0.01247) | 68.62th | v1 |
| Apr 14, 2021 | 1.25% (0.01247) | 0.00th | v1 |
References (10)
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html vendor-advisoryx_refsource_SUSE
- https://access.redhat.com/security/cve/CVE-2019-18802 Vendor Advisory
- https://blog.envoyproxy.io x_refsource_MISCProduct
- https://bugzilla.redhat.com/show_bug.cgi?id=1773447 Issue Tracking
- https://github.com/envoyproxy/envoy/commits/master x_refsource_MISCPatch
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4 x_refsource_MISCExploitThird Party Advisory
- https://groups.google.com/forum/#!topic/envoy-users/m7z5fGkCzPI
- https://groups.google.com/forum/#%21forum/envoy-users x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2019-18802
- https://www.cve.org/CVERecord?id=CVE-2019-18802
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00034.html | vendor-advisoryx_refsource_SUSE | |
| https://access.redhat.com/security/cve/CVE-2019-18802 | Vendor Advisory | |
| https://blog.envoyproxy.io | x_refsource_MISCProduct | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1773447 | Issue Tracking | |
| https://github.com/envoyproxy/envoy/commits/master | x_refsource_MISCPatch | |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-356m-vhw2-wcm4 | x_refsource_MISCExploitThird Party Advisory | |
| https://groups.google.com/forum/#!topic/envoy-users/m7z5fGkCzPI | ||
| https://groups.google.com/forum/#%21forum/envoy-users | x_refsource_MISC | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-18802 | ||
| https://www.cve.org/CVERecord?id=CVE-2019-18802 |
Change history (0)
No recorded changes yet.