envoy: an untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1
Published Dec 13, 2019
9.8
CRITICALCVSS 3.1
EPSS 2.50%
Description
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send HTTP/2 requests that write to the heap outside of the request buffers when the upstream is HTTP/1. This may be used to corrupt nearby heap contents (leading to a query-of-death scenario) or may be used to bypass Envoy's access control mechanisms such as path based routing. An attacker can also modify requests from other users that happen to be proximal temporally and spatially.
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:N/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 3, 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 (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.50% (0.02502) | 84.18th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.50% (0.02502) | 82.60th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00045) | 10.96th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.43% (0.00435) | 74.95th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.43% (0.00435) | 73.94th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.43% (0.00435) | 71.75th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.47% (0.00469) | 71.75th | 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)
- https://access.redhat.com/errata/RHSA-2019:4222 x_refsource_MISCThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-18801 Vendor Advisory
- https://blog.envoyproxy.io x_refsource_MISCProduct
- https://bugzilla.redhat.com/show_bug.cgi?id=1773444 Issue Tracking
- https://github.com/envoyproxy/envoy/commits/master x_refsource_MISCPatch
- https://github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp x_refsource_CONFIRMExploitThird 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-2019-18801
- https://www.cve.org/CVERecord?id=CVE-2019-18801
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/errata/RHSA-2019:4222 | x_refsource_MISCThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2019-18801 | Vendor Advisory | |
| https://blog.envoyproxy.io | x_refsource_MISCProduct | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1773444 | Issue Tracking | |
| https://github.com/envoyproxy/envoy/commits/master | x_refsource_MISCPatch | |
| https://github.com/envoyproxy/envoy/security/advisories/GHSA-gxvv-x4p2-rppp | x_refsource_CONFIRMExploitThird 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-2019-18801 | ||
| https://www.cve.org/CVERecord?id=CVE-2019-18801 |
Change history (0)
No recorded changes yet.